Newbie needs help. PLEASE!
 

New to the site, but see it is very helpful. I recently traded for a 01 2500 2wd automatic truck. It has picked up a bad miss in it, and at first, after reading on the site here, I thought it was the converter. But now it has got worse to the point that if it acts up when you are coming to a stop it will die. It will start right back up no problem at all. I checked the codes in the dash and got the 0234 code. New to the diesel world, but the way i'm reading on here i think the map sensor is bad. Any help is greatly appreciated. Thanks in advance.

I believe thats an over boost code. Is the truck stock or has there been any modifications? I've never heard of that causing a mis though.

Here is a list of codes for our trucks.

Katoom is 100% correct. P0234 Turbocharger Overboost Condition.

Here is a search for P0234.

Lest us know about the mods though.

To my knowledge the truck is stock. There is no tuner box or anything, but I have noticed somebody did put a new exhaust with a new muffler, unsure of what kind. Thanks.

P0234 over boost will cause ECM to derate power by defueling.
Inspect for a leak at the brass 90 degree fitting which screws into the turbocharger compressor housing. There SHOULD NOT be a hole in this brass fitting. A hole may have been drilled to intentionally alter the operation of the wastegate. To repair this problem, the brass fitting can be replaced with a commercially available 1/8 NPT 90 degree brass fitting.

You could also have a failed waste gate actuator.
A new kit has been released that will allow technicians to repair turbochargers with failed wastegate actuators. Wastegate actuators that have failed can cause low power complaints or noise complaints from air escaping out of the actuator.

That is what I have been thinkng, that it is in the wastegate system. Because you can be sitting still and all of a sudden the truck will surge and almost sounds like it just burps out the tailpipe. Thanks again for all the suggestions. Keep em coming.

That doesn't sound normal. What exactly happens?

I've been running for at least 30,000 mi with an over boost code (cleared multiple times with scanner). Sticky waste gate is causing it. No driveability problems. Max stock boost is supposed to be ~20# beyond which truck will defuel. I haven't noticed a change but am almost at redline so don't go past 25# boost. That said, wastegate should not cause any problems under stock boost limit. Look elsewhere for your miss.

Have you done the basics of oil and fuel filter change since you bought it?

Yes and when I changed the fuel filter it looked as good as the new I put in. After changing the fuel filter it seemed to help for two or three days. Now the truck will start right up and then just die just like the fuel system is losing prime. Any more help is greatly appreciated. Thanks.

You may have two problems.... The code is showing one. But other things point to another. If it seems like your not getting fuel then you its a good bet that your not. I have seem many times on vehicles where are pretty clogged fuel filter keeps a weak pump going. Meaning the clogged fuel filter keeps pressure on the fuel pump. Then you replace the filter with a new one that flows better the pump now works longer/hard to keep up the pressure. A weak or failing fuel system wether its the supply pump or injection pump explains your symptoms. But I will say it does not confirm your code. That is why I say you may have two problems. But I would say for sure now you have a fuel problem. Wether it is supply pump or injection or possibly both now if it has been ongoing.

Just some info for you guys I filled my truck up the other day and I was gonna fill it completely up. When it got full it started running out on the ground. It looked like it was coming from the top of the tank. Just wondering if this could be some of my problem. Didn't know just curious. Thanks in advance.

Running or dripping? Obviously a leak but is it the fuel supply line, the return fuel line, cracked rubber plug, or somethings just loose. Time to climb under there and take a look.

You can follow the fuel lines all the way to the tank. Look for wet spots. Also look at the T fitting on the back drivers side of the head.

While you're under there, look for other oil, trans, brake etc leaks.

It was gushing out. Gonna try to get under it in the next couple of days and find out whats wrong. Thanks.

O1 that should have in tank fuel transfor pump. Sounds like you got what I have with the wifes 01 grand am. I had a real good quote on a new fuel pump and to have it instulted. What I did not anticipate was that shop did not install the seal between the pump and the tank correctly. For about a year we were not able to fill the tank all the way up because it was a top tank mounted pump. When the fuel in the tank got above the seal ie. the fill tube it would run back out until it was lower then the seal.

Short anwer is check the seal between the tank and the lift pump. I have a real good feeling that the seal is cracked or missing. A fuel compliant oring will prolly fix it right up...

could be losing prime because of a rotted draw straw,i just ordered one from vulcan performance was pretty cheap,either way tho you gonna hafta drop that tank to see whats goin on

I had the same problem. The quick connect fittings on top of the tank were corroded and had holes. This led to loss of prime (air in fuel) and erratic running. Since I am a cheapskate I removed the quick connect fittings and installed a 10mm id rubber fuel hose and glued it in. I left the original module with the strainer etc in place, but have 10mm (3/8") id and no more air/fuel leaks.
HTH

AlpineRAM

Now my truck is showing a 370 code. Could someone let me know exactly what this code means. And what needs to be done to fix the problem. Thanks in advance. I've looked on the code list and it says a timing problem just trying to figure out were to get started any help is greatly appreciated.

P0370 Fuel Injection Pump Speed/Position
Sensor Sig Lost
Problem caused by internal fuel injection pump failure.

First off I don't think a stock 01 has intank pump, unless it war retrofitted by the dealer.
Secondly, miss at idle sounds like a VP44 issue to me. I would monitor behavior at medium highway speed and any lack of response will confirm this (if the truck does not die first from the other codes).
As far as overboost goes, I never was able to overboost my truck until I put in aftermarket injectors AND a chip. Overboosting with stock injectors would make me think the VP is overfueling. Is there lots of black smoke any time you accelerate?
In any case looks like, unfortunately, a new injection pump might be needed. On the upside once you replace it, it will be good for a long time. Just make sure the lift pump is up to par.

Thanks for all the help. NO black smoke paul but I'm pretty sure it's the vp44 pump failure. Now, the next question is what kind of pump is the best bang for the buck and were is the best place to buy the pump. Thanks in advance.

Got mine from here. Little bit more, but guaranteed chip is new.