Hesitates when warm - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 12-27-2006, 10:15 AM   #1
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Default Hesitates when warm

My Bonneville SOMETIMES hesitates when accelerating from a dead stop. It feels like it is either not getting enough gas or not enough ignition advance. Here are some facts:
  • No engine code
    Does not do it when completely cold
    Problem is intermittant
    Goes away after about 2200 RPM
    Goes away if you completely left off the gas pedal, and hit the pedal right away
    Replaced the TPS with no change in symptoms
    Replaced the MAS with no change in symptoms
    Replaced the MAP sensor with no change in symptoms

Any ideas?
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Old 12-27-2006, 10:21 AM   #2
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When was the last tune up of plug, wires etc?
Have you ever removed and cleaned the throttle body?
What plugs/wires are currently on the car?
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Old 12-27-2006, 10:24 AM   #3
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My '95 FSM gives these possibilities for hesitation: ('98 FSM may be different?)

TPS or wiring
Oxygen sensor
Fuel pressure
Contaminated fuel
EVAP canister purge system
Fuel injectors
Spark plugs, wires
Ignition system ground (ICM mounting bolts)
Correct PROM
Thermostat proper heat range and functioning
Air leaks between MAF sensor and throttle body
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Old 12-27-2006, 12:12 PM   #4
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Good questions. Here are some answers:
  • Spark plug wires changed 2 months ago, Bosch
    Plugs have not been changed in quite awhile
    Throttle body was cleaned 1 month ago (UIM/LIM fix)
    Plugs are AC 41-921
    Oxy sensors were changed 40k miles ago
    Fuel filter change 30k miles ago (hoping to fix this problem)
    Fuel injectors rebuilt 1k miles ago

    The most interesting symptom to me is that when it is stumbling, if you let up on the gas and hit it right away it is fine. What could that be telling us?

    I wish it gave an engine diagnostic code. At one time it did give a TPS code, which led me to replace the TPS hoping to eliminate this problem too. But it had no affect on the hesitation problem.
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Old 12-27-2006, 12:16 PM   #5
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Honestly..

It could easily be wires and plugs. Bosch doesn't work well on a waste spark system. (Good read around here recently). At the least..I'd be inclined to have you pull the plugs and check them.

Edit: Bosch info is imbedded in this thread.
http://www.bonnevilleclub.com/forum/...c.php?p=765279
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Old 12-27-2006, 12:59 PM   #6
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Does it also do it when you just give it a little gas when you first take off?

and does it do it if you hold the brake and give it just a bit of gas?

if so, you might have had the same problem as me, it was the EGR.
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Old 12-27-2006, 01:41 PM   #7
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Replace the Bosch plugs, with either NGK, Ac Delco or Autolites... And then get back to us

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Old 12-27-2006, 01:43 PM   #8
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Quote:
Originally Posted by jr's3800
Replace the Bosch plugs, with either NGK, Ac Delco or Autolites... And then get back to us
Psst..Don.. the plugs are AC.. wires are Bosch..
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Old 12-27-2006, 01:46 PM   #9
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The plugs are not Bosch, but the plug wires are.

The plugs are AC 41-921. They look OK, but are quite old.

Bandit, I have not tried holding the brake and giving it gas, but it does it with just a little or a lot of gas pedal.

I just replaced the EGR too about 1k miles, along with a new o-ring.

Billboost; I read the thread you refered to. Since my Bonny is normally aspirated it appears that I can go with any of the plugs. What would you recommend?
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Old 12-27-2006, 01:49 PM   #10
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If you are looking for a longer maintenance schedule the Iridiums. If you want lower cost..TR55'* or AC Delco copper equivalents.
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