Question about Chevrolet Cobalt

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My chevy cobalt sometime jerks when driving or accelerating or while stopped at lights, I have changed gas to Shell from the Walmart/Murphy brand and it seems to have helped some, but it still does it periodically. I have put in heet and engine/fuel line cleaner. Do you have further suggestions.

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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  • 5 Answers

SOURCE: surging while driving

This is a notorious problem with the Windstars. There are oodles of ground straps in them. Make sure they are all clean and tight. ESPECIALLY THE STARTER GROUND STRAP. If it's loose, the car may just die when you turn up into a driveway or parking lot or just go over a bump. If you notice the "Check Engine" light comes on momentarily, at the time of the surge or the engine kills completely, it's DEFINITELY the starter ground strap! My engine used to kill at odd times -- even when on the freeway going at 75!-- Then we'd go over another bump and SURGE_O_RAMA, the engine's running again or I'd restart it and it would be fine for a while. What's happening is the loose ground strap loses it's connection when you go over a bump in the road. The next bump jogs it back into the connected mode, albeit tenuous at best. All of the computer techs couldn't find the problem. It took a 70-year old seat-of-the-pants mechanic to make the SIMPLE fix. It took so long to find the common-sense mechanic, however, that the down-shot of all of the surging tanked my tranny, which I had to have rebuilt! AND then, after I drove away from the 5-star AAA BBB "transmissing" shop, I found that THEY HAD NOT TIGHTENED ALL OF THE GROUND STRAPS! I took it back. They had no knowledge of ALL 9(?) ground straps and had to take it to THEIR mechanic who tightened them ALL down! It's been 5 years since then and I haven't had another problem with it. RULE OF THUMB: EVERY TIME YOU HAVE THE VAN SERVICED have them tighten-down ALL of the ground straps! If your mechanic doesn't know what you are talking about, go find a new mechanic. Generally, the AAA "Top Shops" are your best bet. They fix things right the FIRST time. I still haven't found a manual that has all of the ground straps listed, by the way.

Posted on Oct 09, 2008

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PyroPCMan
  • 405 Answers

SOURCE: 98 pontiac bonneville hesitation and jerking

When was the last time spark plugs and wires where done? That could be a possible cause, also check the timing through the distrubotor cap.

Hope this helps

Posted on Jun 30, 2008

fyrebyrd1
  • 121 Answers

SOURCE: 2000 malibu jerks when driving.

I would check the transmission fluid level. Sounds like the fluid level is low.I hope this helps

Posted on Nov 16, 2008

rylee_smith
  • 8619 Answers

SOURCE: PO420 CODE ON CHEVY S10

Hi

The code means---

Catalyst Efficiency
Below Threshold
(Bank 1)

Please make sure there is no air entering the engine behind the maf, such as a vacuum leak or leaks in ducting between the maf and the throttle body.

If that's no the case then its an issue with injectors clogging and they are not working due to "fretting". This "fretting" is electrical terminals to injectors getting oxidation on them and is fixed by unplugging them and replugging them in. The fix is to put a small dab of die-electric grease on the terminals.

I would suggest an injector service with the new GM procedure using "Top Engine Cleaner". This may be all you need but that P0420 bothers me. P0420, Catalyst System Efficiency Below Threshold, can be set by a poor connection at the PCM or a damaged wiring harness.

Please rate this soluton as FixYa if found useful.

Thanks
Rylee

Posted on Mar 01, 2009

  • 66 Answers

SOURCE: 1995 Chevy K1500 4.3L V6. Engine has inconsistant idle

Have you changed the fuel pump yet?I had the same exact problem.I replaced my fuel pump with an AUTOZONE PIECE OF JUNK fuel pump.That pump lasted almost 2 days.The second day i had it the truck didnt want to start but it did and it ran like ****,and when i put it in gear it ran as long as I didnt touch that gas pedal.You could go get a fuel pressure test or just replace it,your call.You might want to check your filter too but im sure its the pump.Good luck

Posted on Apr 27, 2009

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