I have developed a bucking problem that occurs due to a very sensitive throttle peddle. I'm wondering if the modifications I've done is causing this or if it's the result of the &quot; throttle linkage recall &quot; This condition became noticeable after I did the throttle linkage and the 370's and the timing advance (&gt; 15* ) and the 3k gsk. Any ideas? Anyone?<br>Andy

 

Are you sure it's not the clutch!!!!!

 

There is a 1997 TSB, TSB 18-29-97A, that is for bucking with 5 speed transmissions. The TSB costs about $200 and has revised throttle arm and springs.

 

JRR,<br>I'm sure it's not the clutch because it will run smooth even under heavy acceleration. It only happens when I hit a bump in the road at low rpm and I develop a &quot;jumpy&quot; foot. It's hard to control.

 

John,<br>I'll check into that TSB. Thanks.<br>Andy

 

Part of the throttle recall kit is a new throttle return spring, wonder if it is softer ???

 

I had the recall done to my truck and the throttle return spring has broken 5 times.<br>DM01

 

I fixed a buddies truck of that prob by putting a $2 spring on the return at the pump.<br>On mine I learned to hold my foot to the right against the floor hump when under a load and it controls it just fine. ;D<br><br> : Eddie : 8)

 

Bucking and Throttle Return Spring Update <br><br>I asked Piers what causes the bucking I have observed three times in the last 18 months when towing with my 97 automatic. He thought the problem was probably throttle return springs. <br><br>There is a 1997 TSB, TSB 18-29-97A, that is for bucking with 5 speed transmissions. The TSB costs about $200 and has revised throttle arm and springs. Apparently when you bomb an automatic, you can also get conditions of low rpm (1200-1500 rpm) and light throttle with TC lockup that can initiate throttle oscillation and bucking as observed with the 5 speeds. <br><br>Issue 18, page 22, of the TDR has an article on bucking and changing the throttle return springs to cure it. I went to the dealer and found that the part numbers for heavier throttle return springs has changed in the last 5 years. <br><br>The current number for 94-96 vehicles is 4874476. This is a double spring, one spring inside the second spring. This double spring replaces the original single throttle return spring. The new spring is about $3. <br><br>The 97-98 12 valve engines have two side-by-side throttle return springs. The TDR issue 18 article called out replacement of the throttle return spring toward the outside of the engine/pump. The curent part number for the outside spring is 5003737AA and about $30.00. The current part number for the inside spring is 4883996AA and about $5.00. <br><br>The inside spring appears the same as the two original springs The expensive outer replacement spring is larger diameter wire and coil and appears to be about 3 times as stiff as the original spring. <br><br>I replaced both springs on my 97 and found the inside spring had been stretched out about 3/8 inch (since original installation?). After installation the accelerator pedal pressure appears to be 2-3 times higher than before. Hopefully this will prevent any future bucking.<br><br>

 

Thanks to all of you for your helpful info. It looks like heavier springs is the answer. When the problem is corrected, I'll post the solution.<br>Andy