1987 Cadillac Deville acceleration jerks

Tiny
CREATION2000
  • MEMBER
  • 1987 CADILLAC DEVILLE
  • V8
  • FWD
  • AUTOMATIC
  • 145,000 MILES
When I am accelerating the car jerks like a spark plug is out, however, the car revs fine at idle. Coasting is no problem.
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Thursday, June 11th, 2009 AT 12:57 PM

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Tiny
MERLIN2021
  • EXPERT
If service engine soon light is on read the codes, let me know and I can post a quick how to, if not test fuel pressure.
HESITATION, SAG, STUMBLE This is defined as a momentary lack of response as the accelerator is pushed down. It can occur at all vehicle speeds. Usually it is most severe when first trying to make car move, as from a stop sign. Condition may be severe enough to cause vehicle to stall. Possible cause & correction Check for proper operation of thermostatic air cleaner. Check for proper EFE operation. Check for correct fuel pressure of 9-12 psi in all speed ranges. Also check for contaminated fuel. Check vacuum hose to MAP sensor for leaks or restrictions, and restrictions at MAP port on throttle body: Tee vacuum gauge into MAP hose at sensor. Gauge reading and parameter value (.0.2/ P.0.2) should be about the same and respond quickly to changes in engine load. Check for fouled, cracked, or defective spark plugs or spark plug wires. Check for correct PROM number (parameter.1.3/P.1.3). Check TPS for binding or sticking. Check ignition timing. Check for proper operation of EGR system. Check fuel injectors: With injector connectors disconnected, check for fuel leakage from injectors while cranking. Reconnect injector connectors. Also check injector spray patterns. Check for open in HEI ground circuit. Check for proper operation of canister purge system. Check for carboned, or sticking valves. Check for restricted exhaust and catalytic converter.
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Thursday, June 11th, 2009 AT 3:28 PM

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