99 Durango hesitates when accelerating - Dakota Durango Forum
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post #1 of 40 Old 03-13-2011, 10:41 PM Thread Starter
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99 Durango hesitates when accelerating

A friend of mine has a '99 Durango, 318, 4x4. They just bought it & it was fine when they got it. Right on time, a week later, problems start cropping up. The one that is worrysome is the truck stumbles & hesitates after coming up to operating temperature. When the truck does a quick stop (like at a stop sign), it doesn't have the problem. When it stops for more than 5-10 seconds (like at a traffic light), it tries to die as soon as you push the throttle. We have changed out the idle air control valve & the throttle position sensor. We have looked for any obvious signs of air leaks from hoses. We are hoping that it's not the PCM or anything dealing with the timing. Does anyone else have any other ideas as to what the cause may be?

2002 GMC Sierra reg. cab stepside.
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post #2 of 40 Old 03-13-2011, 10:48 PM Thread Starter
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Just in case this helps, we test drove it before we replaced anything. When the truck hesitated, I gave it a lot of throttle, & it caused the "check engine" light to flash, but not stay lit up. Plus, the smell of raw fuel was noticed, as well as a backfire or two.

2002 GMC Sierra reg. cab stepside.
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post #3 of 40 Old 03-13-2011, 11:00 PM
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I'd say an o2 sensor. Pretty weird how the light flashed, but didn't stay on.

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post #4 of 40 Old 03-13-2011, 11:07 PM
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X2 Definitely sounds like an 02 sensor



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post #5 of 40 Old 03-13-2011, 11:22 PM Thread Starter
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I have to laugh at both of those responses. I helped the same guy with his 01 Altima that DID throw a code. The first thing we tried were the O2 sensors. But his code pointed to the emissions system. Like I posted, with no code shown in the computer, I wouldn't think O2 sensors.

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post #6 of 40 Old 03-13-2011, 11:46 PM
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Well your problem is obviously from running rich, why did you change the iac and tps?

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post #7 of 40 Old 03-14-2011, 12:12 AM Thread Starter
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Quote:
Originally Posted by Chad7531 View Post
Well your problem is obviously from running rich, why did you change the iac and tps?
We changed those because they seemed to be related to engine drivability. We don't even know that the engine is running rich. I didn't mention it, but this truck has over 220k miles. I have been reading that some people had been experiencing the same problems & had some connection to the power steering switch leaking & causing a problem in the wiring harness which could screw up the O2 sensors. Does anyone know if this can actually be true? It doesn't make a bit of sense to me, but WTF do I know?

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post #8 of 40 Old 03-14-2011, 12:29 AM
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Since you said you were smelling gas, I would assume it's running rich. What doesn't make sense to me is the blinking cel, almost points to something faulty with the o2s again.

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post #9 of 40 Old 03-14-2011, 12:45 AM
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The pre-cat 02 sensor on my Durango didn't throw any codes either. I read here others had the same issues and pointed to the 02 sensor as the culprit. I changed mine and the trucks been purring like a kitten ever since. So go ahead and laugh.



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post #10 of 40 Old 03-14-2011, 12:46 AM Thread Starter
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My buddy is confident that the power steering pressure switch has something to do with it. So far, Auto Zone & Advance don't show a switch like that. I've told him that we won't just put stuff on unless we know that these parts are real & can cause this problem. We got a power steering pressure hose, but the power steering leak & the stumbling problem aren't normally related. The raw fuel smell I would have blamed on no spark going into the cylinders & therefore unburned fuel when it was hesitating. Once all is said & done, we will probably replace the O2 sensors, but we won't just slap a pair on it unless we are at least 99% sure that would fix the problem.

2002 GMC Sierra reg. cab stepside.
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post #11 of 40 Old 03-14-2011, 03:24 PM
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You have a misfire...that's why the check engine light is flashing.

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post #12 of 40 Old 03-15-2011, 04:35 AM Thread Starter
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Originally Posted by l1tech View Post
You have a misfire...that's why the check engine light is flashing.
That's not unreasonable, but do you know of a possible cause? Or a possible remedy?

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post #13 of 40 Old 03-15-2011, 04:51 AM
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Lets see...cracked spark plug, bad spark plug wire, bad distributor cap, bad distributor rotor, weak coil, burnt valve etc.....

You need to get your hands on a scanner that shows you cylinder misfires so you can pin it down to a single cylinder and go from there.

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post #14 of 40 Old 03-16-2011, 12:19 AM Thread Starter
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Quote:
Originally Posted by l1tech View Post
Lets see...cracked spark plug, bad spark plug wire, bad distributor cap, bad distributor rotor, weak coil, burnt valve etc.....

You need to get your hands on a scanner that shows you cylinder misfires so you can pin it down to a single cylinder and go from there.
I didn't know that there were any scanners that could sense a cylinder misfire except for some expensive model that a repair shop might use. We have to replace the power steering pumP anyway, we may just do a tune up anyway.

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post #15 of 40 Old 03-16-2011, 02:53 AM
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I don't know about the cheap scanners, I have mostly factory scanners and 2 high end aftermarket scanners

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