My regal is surging while idleing and hesitates like it is losing power when I accelerate. It only does the hesitation sometimes and when the engine is hot. I had my ignition module, all 3 coil packs, spark plugs, crankshaft sensor replaced. Vacuum hose and fuel filter cleaned. I have been to 4 different places and none of them can figure out what it could be. Code 42 came up back in December which is the C3I Electronic Spark Timing Failure. My service engine light did not come on since I had it reset. I had all this done and it is still doing it. Someone told my cam sensor could be bad but that should of came up on the computer because the mechanic said he tested everything and they were fine. Im tired of getting the run around. So if you know what it could be. Please feel free to respond. Thanks
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1990 Buick Regal
Question: Engine Surging and Hesitation While Accelerating
Answer #1Bret Bodas from RepairPal Test Shop, February 16, 2010, 11:01Master
Have you had the fuel pressure checked? What about a throttle body service? These two things will cause idle issues and the pump can cause the acceleration issues.
I wouldn't replace any more parts unless they are found to be bad.
Visitor, June 29, 2010, 09:38
Your hesitation may be due to a dirty throttle body, or Mass Airflow Sensor. Clean them both appropriately (You'll need mass airflow cleaner). Also ensure you're vehicle is getting enough air (check air filter).
These are CHEAP easy things to do and should be done every 30K or so.
With your spark timing failure, you may also have a bad injector. Fuel injectors have moving parts which wear out over time (regardless of how often they are cleaned). As they wear out, they may fire early/late, resulting in not a clean burn. You can have them professionally cleaned (the fuel additives only do so much), or you can have them replaced. Professional cleaning does clean deposits, but no amount of cleaning will repair the worn parts in the fuel injectors. Most vehicles will see a significant improvement when the injectors are replaced around the 90K mark. If your vehicle has more than this, you may consider replacing them all. You'll be surprised at how much power is restored when you do so.
And if you're vehicle savvy, Fuel injectors are about as easy to replace as the spark plugs. Just make sure you depressurize the fuel system prior. (To do so, unplug the inertia switch, then start the engine until the fuel is used and the engine stops).
Answer #3rightiousangel September 13, 2010, 20:23Rookie
I am still having the exact same problem as this. The car has a new fuel pump, new Catalytic converter, TPS Sensor, New Spark plugs, new wires, new fuses and relays for the ECM, new O2 sensor. I've been told it could be the Cam Sensor or the Ignition Module. I would like to know if anyones has found another possibility that I could try before replace the CAM Sensor or the Ignition module that is pretty expensive.
ReplyVisitor, October 14, 2010, 20:27
I HAD THE SAME PROBLEM,TURNED OUT TO BE BAD WIRE HARNESS THAT LEADS TO THE MAF SENSOR.MINE WAS HESITATING,STALLING EVERYTIME I COME TO A STOP AND GO IT STALLS BAD THEN KICKS IN IDLE WAS VERY LOW THEN JUMPS UP THE BACK DOWN.I HAD CHANGE MAF AND O2 SENSOR,FUEL FILTER,FUEL PUMP,CAT CONVERTERS AND GOT TIRED OF SPENDING MONEY.SO HAD A FRIEND COME BY AND THAT WAS THAT......GOOD LUCK!
Replyjesse1986, May 21, 2013, 11:18Rookie
where did you find the wire harness