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Showing results for tags 'hesitation'.
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Ever since purchasing this 86 VR in April, I have been chasing an acceleration hesitation problem. Only hesitates when engine is at idle and the throttle is cracked open. The motor does not respond and hesitates and may even die. I have been completely through the carbs, including new sliders and diaphragms. No vacuum leaks at alll anymore. Is this a symptom of running too lean or too rich? Everything else is fine, compression is great, plugs are new, well fairly new, new wires, boost sensor is operational, no problems with the vacuum line to the boost sensor. Valve adjustment is right on. What am I missing? I think is still a carburetion issue but can't pin it down. Any thoughts? -
We're having an issue with the 2002 Intrepid (2.7L V6) my daughter drives. Sometimes (and becoming more frequent) when accelerating from slow speed or stop there is a massive hesitation. The RPMs might rise a little bit but then acceleration stops and the tach stays steady. I can hear the intake noise from the open throttle plate but there is no power. No perceptible stumble, just no power. If the pedal is released the engine idles fine. After 15 seconds or so everything straightens out and it runs great. The service engine light seems to be non functional. The OBDII is showing five codes, four for the four oxygen sensor heater circuits and one for a multi cylinder misfire. I'm assuming the multi cylinder misfire is being set when we see the hesitation. My understanding is that the O2 heater circuits should not create a driveability issue. For those of you that have been around outboard boat motors: The engine sounds just like when you open the throttle butterflies on an outboard without pushing the linkage that works the spark advance. There is the BWAAAA of intake noise but little RPM increase and no power. I had similar behaviour with a Virago where the TCI was not advancing the timing. So I suspect the hesitation is being caused by a failing PCM not advancing the ignition timing. Of course the problem is intermittent enough there is little chance of verifying that with a timing light. Appreciate any feedback on my reasoning or alternative thoughts. Thanks.
