Question about GMC Yukon

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My 5.7 liter flex fuel will start sometimes, will rev up to 1,000 rpm, then drop to about 300 rpm and run rough before shutting off a few seconds later.

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Sounds so much like temp. sencer, also check ATS its on the air horn has two wires going to it , clean that connection. Also remove censer from air horn and clean carbon from internal side

Posted on Mar 21, 2011

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Intake manifold gasket leak messing with air/fuel mixture.cars comp cant account for extra air being sucked in....

Posted on Mar 21, 2011

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Hyundai Tucson 2009 give P0193, change complete rail with sensors. Change High pressure pump, low pressure pump in the tank but still not starting. After holding the key in the start position for almo


A few things come to mind.
After a fuel failure like that it is possible you have fouled the plugs, causing a hard start, rough idle.
Also, if it was run any length of time in that state its possible the catalytic converter has become slightly clogged not allowing the rpm's to climb.
I would start with a quick check of the plugs.

Jan 13, 2015 | 2009 Hyundai Tucson

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1998 Dodge 1500 5.9L, running rough, no power, does not do this all the time..


I had a similar problem on a 2004 Jeep Grand Cherokee V8 engine.
Nothing seemed out of the ordinary except that occasionally the engine would run rough. Another seemingly unrelated symptom was that when shifting out of Park the transmission would sometimes jolt.

Turns out that I had a bearing on the serpentine belt tensioner that was freezing up. My belt broke and while I was changing the belt the pully on the tensioner fell into my hand. The bearing had seized and the plastic hub had disintegrated. After getting the new tensioner and belt. I noticed that the rough engine and the hard shifting transmission problems have gone away.

Seems that the engine was having to work harder to overcome the bad bearing.


Another cause of rough engines comes from dirty fuel injectors. The best solution I have run across is Chevron's Techron fuel additive. I had a honda Prelude that had a rough running engine. The Honda technician advised me to start adding Techron when I fill up. Worked like a charm. After the second tank I had no more problems. I have tried other fuel additives over the years, but Techron seems to be the best.

Also be sure to change your fuel filter. A dirty fuel filter will cause a noticeable drop in power.





Mar 03, 2014 | 1998 Dodge Ram

1 Answer

1993 3.4l camaro Idles fine when first started. After a few seconds it idles rough and rpm drops. No power when driving. RPM will not go above 3000 even if floored when driving.


there are a few reasons to ur problems 1st check and or replace fuel filter -check and or service egr valve -carbon usually builds up in and around valve causing rough idle -no power and can cause non start problem ---also air filter - fuel pump-bad gas -timing skip-pcv valve-catalytic converter clogging these are some of the problems usually one of the first 2 is the problem good luck

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4.3 L will not idel


check the Idle Stop Solenoid

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sounds like the throtle position sensor is miss alined or the idle screw is backed off

Dec 16, 2009 | Hyundai Motor 2002 Elantra

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Rough, shaky hot or cold starts on W202+short pwr loss mins later


Check the cable near the abs modulator. Some C180, C200 have short circuit from broken insulators

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2 Answers

Engine dieing


Sounds like bad carbon build up, have you tryed using fuel injection cleaner yet? Because of the buildup, I would suggest putting it in with only a half a tank (to get a higher concentration of cleaner vers fuel). Once in, run it down the highway (the cleaner works best when the engine is hot) until you are almost out of gas, then fill it up and add another bottle of injector cleaner (alway add the injector cleaner after filling as the cleaner will foam if added before and this will lead to gas spillage at the pumps). Run the car normally. If it is just carbon, by you next tank of gas the problem should be solved. As pervention, I recomend using fuel injection cleaner every 4 tank fulls (for most people it works out to about once a month).

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