mikecoachusa Posted August 25, 2014 Report Share Posted August 25, 2014 I have a 1990 buick regal coupe, 45000 original miles, 3800 engine. at highway speeds it will suddenly jerk 2-4 times and then be fine. any suggestions?? Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted August 25, 2014 Report Share Posted August 25, 2014 does it only happen once per drivecycle? Quote Link to comment Share on other sites More sharing options...
mikecoachusa Posted August 25, 2014 Author Report Share Posted August 25, 2014 does it only happen once per drivecycle? no it will happen periodically, especially under load like pulling a long grade at hwy speed Quote Link to comment Share on other sites More sharing options...
tsilney Posted August 25, 2014 Report Share Posted August 25, 2014 Sounds like a coil pack.or a icm. Mine would buck under load..changed.out coil packs and icm runs perfect...but I would check wires and plugs as well. Sent from my SCH-I545 using Tapatalk Quote Link to comment Share on other sites More sharing options...
mikecoachusa Posted August 25, 2014 Author Report Share Posted August 25, 2014 coil paks were replaced 2 months ago, but the old ones were fine. i will try them again. ECM is new Quote Link to comment Share on other sites More sharing options...
Chris2012 Posted August 25, 2014 Report Share Posted August 25, 2014 coil paks were replaced 2 months ago, but the old ones were fine. i will try them again. ECM is new I think you mean ICM. Anyway on my van, which has 2 crank sensors bucking could be a function of 1 (or both?). Not there yet ... No white smoke out the tail? Quote Link to comment Share on other sites More sharing options...
Chris2012 Posted August 26, 2014 Report Share Posted August 26, 2014 Oh and don't rule out the computer, my 3.1 Lumina had been doing crazy dances until it wouldn't start altogether 1 day. I waited 6 weeks last year before replacing it, didn't even swap the prom - started right up. And despite receiving a message from God - I could tell the story - that it was the computer the day it died or the day after, I chose to keep troubleshooting. And learned tons in the process. Best not to ignore God's messages though LOL. Quote Link to comment Share on other sites More sharing options...
mikecoachusa Posted August 26, 2014 Author Report Share Posted August 26, 2014 no white smoke.....what could be wrong with the crank sensors?? Quote Link to comment Share on other sites More sharing options...
Chris2012 Posted August 29, 2014 Report Share Posted August 29, 2014 no white smoke.....what could be wrong with the crank sensors?? It's one of many possibilities. Some cars have 2, yours probably only 1. I was just putting it out there. if it gets progressively worse your chances of figuring out what it is will be greater, along with whatever knowledge you absorb, and your willingness to troubleshoot. Got a Haynes manual? Helped me narrow down to the problem when I was going through it (really had no way of knowing my problem was the computer until it died/wouldn't start, as I didn't have sophistcated test equipment hooked up to the car while it was operating. If it's just a relatively uncommon event, it's anybody's guess and only a guess. Tune it up, plugs and wires, try some dry gas, fuel injector cleaner, air filter, have the throttle body cleaned. Could be a dirty sensor. Like I said I have an intermittent bucking problem in my van, much more severe then yours, when it decides it wants to be a dancing fool. One thing on the radar is a rely or solenoid in the tranny. But I say many prayers it has nothing to do wit. my tranny. Glad to hear there's no white smoke, or any other color. Quote Link to comment Share on other sites More sharing options...
mikecoachusa Posted September 8, 2014 Author Report Share Posted September 8, 2014 replaced ICM, ECM, plugs, wires and coils. problem still exists Quote Link to comment Share on other sites More sharing options...
Night Fury Posted September 8, 2014 Report Share Posted September 8, 2014 Fuel injectors maybe. You can test them. They should ohm out at ~55? I think Quote Link to comment Share on other sites More sharing options...
runt Posted September 8, 2014 Report Share Posted September 8, 2014 Does that car have MAF or is it speed density? Quote Link to comment Share on other sites More sharing options...
mikecoachusa Posted September 8, 2014 Author Report Share Posted September 8, 2014 MAF Quote Link to comment Share on other sites More sharing options...
runt Posted September 8, 2014 Report Share Posted September 8, 2014 Consider changing the MAF. On my old '01 GP I'd be going down the highway and have the car make a "bang" type of noise. Turns out the car had a bad MAF. I had it confirmed by a dealer on a Tech 2 (local guy, treats me awesome) and swapped it and never had the issue again. There were some trips where it wouldn't do it and others where it'd do it a few times. You could almost say a jerk because it was like the car lot all power for a split second but could come right back up again. Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted September 8, 2014 Report Share Posted September 8, 2014 Fuel injectors maybe. You can test them. They should ohm out at ~55? I think around 12 individually, a whole bank at a time should come up to the 3-4 range. Quote Link to comment Share on other sites More sharing options...
Night Fury Posted September 8, 2014 Report Share Posted September 8, 2014 Well. I was a bit off. Quote Link to comment Share on other sites More sharing options...
mikecoachusa Posted September 10, 2014 Author Report Share Posted September 10, 2014 put in a brand new MAF,,,,, no change; so frustrating! Quote Link to comment Share on other sites More sharing options...
mikecoachusa Posted September 11, 2014 Author Report Share Posted September 11, 2014 Believe this is the problem and solution. will install new TPS soon An intermittent chuggle or hesitation that can be felt during light acceleration or while cruising at highway speeds with no Check Engine light or no fault codes set may be caused by intermittent operation of the automatic transmission torque converter clutch (TCC). The problem is not the torque converter clutch or clutch solenoid, but a faulty input to the powertrain control module computer from the engine's throttle position (TPS) sensor. The fix for this problem is to replace the TPS sensor. Quote Link to comment Share on other sites More sharing options...
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