Power issues
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Power issues Anyone?????????
My truck seems to be losing power.
the setup is
2001 2500 edge comp 4" exaust big air filter
it used to run 31 psi boost and it pulled like no other. now it will only pull 24 psi boost and the power just doesnt seem to be there. i replaced the air and fuel filters last week the FP seems to be ok 16psi at idle and 12 or 13 cruzing down the hw it pulls down to 5 or 6 under hard exceloration. changing the filters helped a little but my fuel milege sucks im only getting 14 or 15 maby 16 on the hw if i drive real nice. but hook onto a trailer and ill be lucky to get 10 were i used to get 16 pulling.
Any advice would be great. I thought maby an injector going to crap.
or maby it needs an overhead done real bad. the only code it is sending in
P1693 i dont know what it is though. I am a truck mechanic. but we have mostly older trucks so i dont know a whole lot about computer controlled deisel engines just what i have learned from working on my cummins.
Thanks Anthony
the setup is
2001 2500 edge comp 4" exaust big air filter
it used to run 31 psi boost and it pulled like no other. now it will only pull 24 psi boost and the power just doesnt seem to be there. i replaced the air and fuel filters last week the FP seems to be ok 16psi at idle and 12 or 13 cruzing down the hw it pulls down to 5 or 6 under hard exceloration. changing the filters helped a little but my fuel milege sucks im only getting 14 or 15 maby 16 on the hw if i drive real nice. but hook onto a trailer and ill be lucky to get 10 were i used to get 16 pulling.
Any advice would be great. I thought maby an injector going to crap.
or maby it needs an overhead done real bad. the only code it is sending in
P1693 i dont know what it is though. I am a truck mechanic. but we have mostly older trucks so i dont know a whole lot about computer controlled deisel engines just what i have learned from working on my cummins.
Thanks Anthony
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Joined: Aug 2003
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From: Eagle. ID
Welcome to DTR!
Big performance changes all at once SHOULD be something the guys on this site can find!
Autozone will read the code free of charge (as long as the CEL is on), I believe the 1693 is a code that indicates that you are storing another code - the general code list is here:
https://www.dieseltruckresource.com/...n&onlynewfaq=1
Is this something that started with a new tank of fuel or any mods or new additives you've not tried before?
Starting with the rock-bottom basics, the engine needs only fuel / air to work, sounds like you have checked the fuel portion hardware; 5-6 psi is a bit low, on the warning side if the rule-of-thumb 7-8 psi min is to be believed. Where are you located? You may be fighting a gelling issues, do you run any additives (PS, Stanadyne, etc.)?
As your boost has dropped, you might take a REAL close look at the boots and intercooler for any tiny holes that may be bleeding off your pressure.....as well as the air filter, which could also be plugged. How are your operating temps (pyrometer reading)?
Would recommend that you get the code read and get back to us with your findings, we'll help if we can....
Note: Pls fill out your signature so we know as much as we can about your truck, it may make diagnosing easier -
Rauschbo
Big performance changes all at once SHOULD be something the guys on this site can find!
Autozone will read the code free of charge (as long as the CEL is on), I believe the 1693 is a code that indicates that you are storing another code - the general code list is here:
https://www.dieseltruckresource.com/...n&onlynewfaq=1
Is this something that started with a new tank of fuel or any mods or new additives you've not tried before?
Starting with the rock-bottom basics, the engine needs only fuel / air to work, sounds like you have checked the fuel portion hardware; 5-6 psi is a bit low, on the warning side if the rule-of-thumb 7-8 psi min is to be believed. Where are you located? You may be fighting a gelling issues, do you run any additives (PS, Stanadyne, etc.)?
As your boost has dropped, you might take a REAL close look at the boots and intercooler for any tiny holes that may be bleeding off your pressure.....as well as the air filter, which could also be plugged. How are your operating temps (pyrometer reading)?
Would recommend that you get the code read and get back to us with your findings, we'll help if we can....
Note: Pls fill out your signature so we know as much as we can about your truck, it may make diagnosing easier -
Rauschbo
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I put my scan tool on it this morning and the only code it showed was
P0234 (Engine over boost condition).
The way it is acting makes me think that maby an injector is going bad. or could it be somthing more serious? any ideas would be great.
P0234 (Engine over boost condition).
The way it is acting makes me think that maby an injector is going bad. or could it be somthing more serious? any ideas would be great.
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Posts: 1,820
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From: My head lays down in Murrieta, but the day light hours are spent in San Diego, Ca.
over boost...... that will most likely be something to do with your map sensor. i've had it before. either the map sensor is going out or you had a bad conection to the map sensor. maybe the rubber seal is bad and you've got junk in the plug. just a guess....
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its possible maby the connection on the map sensor i had a bad oil/fuel leak a lil while back, maby it got the plug wet enough to short across ill check that when i get to the shop in the morning
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Joined: Mar 2002
Posts: 8,311
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From: Holly Ridge, N.C.
rfda_454:
Welcome to the website!
Sorry to hear you are having power problems with your truck. I had a 2002 Dodge CTD 24 valve that I had my share of problems with too! Let me see if I can possibly help you here.
I read your first post and noted the F.P. readings you gave. IMO,....a F.P. reading of 5-6lbs. "under hard acceleration" is too low! Cummins says the pressure should not go below eight (8) lbs. at anytime, so that may be indicative of a possible problem with the lift pump beginning to go.
JPR Ram is giving you some good advice on the MAP Sensor. That sensor is located on the drivers side of the block near the back between cylinders # 5 and #6. As he said, check the connections to that MAP Sensor to be sure no water,fuel, oil or dirt is in the electrical connector section of it. I always used electrical contact cleaner to spray anything out you find there. I would also recommend taking the MAP Sensor out to check and see how dirty it is on the internal side. You will need a 1 1/8" deep well socket to get it out.
Right next to the MAP Sensor is the Intake Air Temperature Sensor (IAT). I would check the connections to that too and also pull it out and clean it off too. Mine sometimes would get a "carbon" looking dirt on it and it seemed to make the truck run rougher when dirty.
I also wonder if you have an air leak somewhere in the system? Make a real good check of all your clamps on the rubber boots especially the ones on the intercooler!! I have seen numerous cases of these boots "slipping off" and owners not even knowing it! Lower boost pressures can be indicative of that.
Check all of those things and get back with us! Good luck.
-------
John_P
Welcome to the website!
Sorry to hear you are having power problems with your truck. I had a 2002 Dodge CTD 24 valve that I had my share of problems with too! Let me see if I can possibly help you here.
I read your first post and noted the F.P. readings you gave. IMO,....a F.P. reading of 5-6lbs. "under hard acceleration" is too low! Cummins says the pressure should not go below eight (8) lbs. at anytime, so that may be indicative of a possible problem with the lift pump beginning to go.
JPR Ram is giving you some good advice on the MAP Sensor. That sensor is located on the drivers side of the block near the back between cylinders # 5 and #6. As he said, check the connections to that MAP Sensor to be sure no water,fuel, oil or dirt is in the electrical connector section of it. I always used electrical contact cleaner to spray anything out you find there. I would also recommend taking the MAP Sensor out to check and see how dirty it is on the internal side. You will need a 1 1/8" deep well socket to get it out.
Right next to the MAP Sensor is the Intake Air Temperature Sensor (IAT). I would check the connections to that too and also pull it out and clean it off too. Mine sometimes would get a "carbon" looking dirt on it and it seemed to make the truck run rougher when dirty.
I also wonder if you have an air leak somewhere in the system? Make a real good check of all your clamps on the rubber boots especially the ones on the intercooler!! I have seen numerous cases of these boots "slipping off" and owners not even knowing it! Lower boost pressures can be indicative of that.
Check all of those things and get back with us! Good luck.
-------
John_P
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From: My head lays down in Murrieta, but the day light hours are spent in San Diego, Ca.
the only thing that i'd add to john p's post is that after cleaning the plugs, be sure to add fresh electro (sp) grease. it'll keep moister from building up and other containaments from getting into the plug.
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From: San Luis Obispo, California
The overboost code is nobig deal, 99% of the time all it is is a lose or leaky hose between the turbo housing and the wastegate actuator bu the rest of the problem seems to sound like a bad or leaky injector
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From: Winters, TX
1693 is your MAP sensor. Look on the right side of your block, about half way down. There will be a small connector. Make sure its clean and plaugged in good.
Same thing happened to me. Truck straight up quit making power at 1300rpm. Turned out my MAP sensor was not connected good...
Same thing happened to me. Truck straight up quit making power at 1300rpm. Turned out my MAP sensor was not connected good...
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Hey guys I havent had a chance to check that stuff yet the shop has been full all week and its still full this weekend
Im hopeing to get it in Sunday night when i get beck from Deadwood SD. im headed up there in the morning for a marti graw party.
I realy hope your advice helps if i cant get it into our shop this weekend ill just do it out in the snow on monday. Thanks again
Anthony
Im hopeing to get it in Sunday night when i get beck from Deadwood SD. im headed up there in the morning for a marti graw party. I realy hope your advice helps if i cant get it into our shop this weekend ill just do it out in the snow on monday. Thanks again
Anthony
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Joined: Jan 2007
Posts: 1,820
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From: My head lays down in Murrieta, but the day light hours are spent in San Diego, Ca.
Hey guys I havent had a chance to check that stuff yet the shop has been full all week and its still full this weekend Im hopeing to get it in Sunday night when i get beck from Deadwood SD. im headed up there in the morning for a marti graw party.
I realy hope your advice helps if i cant get it into our shop this weekend ill just do it out in the snow on monday. Thanks again
Anthony
Im hopeing to get it in Sunday night when i get beck from Deadwood SD. im headed up there in the morning for a marti graw party. I realy hope your advice helps if i cant get it into our shop this weekend ill just do it out in the snow on monday. Thanks again
Anthony
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OK, I am going to go another direction here since you mention you have a COMP.
They only way you can see more boost than 22-24psi is if you have boost fooling which the Comp does have. Now there are only 2 ways you can get an overboost code if you have the Comp hooked up.
1.) You moved the power wire for the Comp and it is killing power too early when you shut the truck off. This should be easy to diagnose since you have a scan tool. Clear your code and start the truck. Then kill your truck and start it back up. If you instantly have a code then this is your problem. The Comp operates off of 12v in order to control the pump. This requires you to tap a 12v source. The MAP sensor is a 5v source and the map signal actually slowly dies when you turn the truck off. Sometimes if you cut power instantly the output of the MAP sensor gets out of range compared to when it is dying down and causes a code.
This is most likel not your issue but, it can and does happen.
2.) The circuitry in the Comp for boost fooling is bad. When the Comp is hooked up your ECM should never, ever see more boost than the Comp allows. The simple way to check this is to disconnect the power wire for the Comp, disconnect the Map sensor connection and plug it back to stock. If you have your wastegate blocked off you will need to put it back to stock so that you make stock boost levels or you will continue to get the code. You can leave the ground and pump wire tapped as it will not affect anything. Then clear you code and start the truck. Then kill the truck and restart and see if you have a code. If not go drive the truck and see if you can get a code at WOT. If you do not get a code then the Comp is having an issue.
If neither of those is it then that stinks.
The 0234 code will make the truck run crappy in a derated mode. This is definately your problem and we need to fix it first. I do not like your FP at WOT but, that is not the issue here. Your wastegate is also not an issue. So try those two thing and I am 99% positive you will find the issue.
They only way you can see more boost than 22-24psi is if you have boost fooling which the Comp does have. Now there are only 2 ways you can get an overboost code if you have the Comp hooked up.
1.) You moved the power wire for the Comp and it is killing power too early when you shut the truck off. This should be easy to diagnose since you have a scan tool. Clear your code and start the truck. Then kill your truck and start it back up. If you instantly have a code then this is your problem. The Comp operates off of 12v in order to control the pump. This requires you to tap a 12v source. The MAP sensor is a 5v source and the map signal actually slowly dies when you turn the truck off. Sometimes if you cut power instantly the output of the MAP sensor gets out of range compared to when it is dying down and causes a code.
This is most likel not your issue but, it can and does happen.
2.) The circuitry in the Comp for boost fooling is bad. When the Comp is hooked up your ECM should never, ever see more boost than the Comp allows. The simple way to check this is to disconnect the power wire for the Comp, disconnect the Map sensor connection and plug it back to stock. If you have your wastegate blocked off you will need to put it back to stock so that you make stock boost levels or you will continue to get the code. You can leave the ground and pump wire tapped as it will not affect anything. Then clear you code and start the truck. Then kill the truck and restart and see if you have a code. If not go drive the truck and see if you can get a code at WOT. If you do not get a code then the Comp is having an issue.
If neither of those is it then that stinks.
The 0234 code will make the truck run crappy in a derated mode. This is definately your problem and we need to fix it first. I do not like your FP at WOT but, that is not the issue here. Your wastegate is also not an issue. So try those two thing and I am 99% positive you will find the issue.