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brink5 08-01-2013 11:31 AM

Idle Problems

At a loss as to what is causing my problem.
I recently acquired a 99 ram 1500 5.2L, and have ran into a problem that on start up the engine doesn't want to idle. I took apart the throttle body and cleaned everything, replaced the IAC and TPS but none of that fixed it. It only really does it in the morning after it has been sitting all night. To keep it running I just keep my foot on the gas for all of about a minutes, then I can let off the gas and it will idle just fine, maybe idle a little lower than normal, but it won't die. No problems driving it after that. The problem seems to be intermittent, as some mornings it fires right up and idles perfectly.

Any thoughts or direction would be greatly appreciated.

No codes have been thrown.


Warlock III 08-01-2013 12:49 PM

Check the upstream 02 sensors. Unplug them one at a time and see if either one makes a difference.

brink5 08-01-2013 01:52 PM

I'm getting ready to leave town for a few days, but will definitely do that when I get back and let you know if that fixed it! Thanks.

brink5 08-11-2013 08:38 PM

Had a chance today to work on the truck.
Went to the auto store and had them scan it even though no check engine light was on. There was a code!

The code was for a bad o2 sensor, though it was for the one down stream, not the upstream ones.

So long story short I changed out that sensor this afternoon. I'll keep an eye on it over the next couple days and see if that fixes it. I'll keep you posted.

Gen1dak 08-11-2013 11:32 PM

I'm wondering if you have a weak battery or poor connection messing with the computer. A partial loss of power will cause the computer to have memory issues that will affect things like idle quality.

brink5 08-16-2013 02:12 PM

Well, changing the down stream O2 sensor didn't help the situation.
I have ordered the up stream 02 sensor, and will change that out when I get a chance.
The truck has some hail damage that is getting fixed right now, so I won't have the truck back till sometime next week. I'll see what happens once I get that replaced!

Had the batter checked, and it appears to be a good battery.

Though when we started the car, the voltage was at 13.9.
They guy said it should be around 14.5. So maybe the alternator is going bad?

Do you think that may be causing my problems?

JonMiller1985 08-16-2013 04:09 PM

Hey all,
New to the forums and new to working on my own.

I have a 1998 Dodge Ram 1500, Laramie SLT, 2WD 5.2L V8 and have a myriad of issues with it. I bought it due to needing another vehicle. It was previously used as a farm truck.

Currently, I am throwing codes for a Lower Left Bank O2 sensor. I know I have one on the cat and the other is right before the muffler. I for the life of me cant figure out which is the lower left bank, and I cant seem to find a straight answer on how many O2 sensors I am even supposed to have. Looking under the truck, I have found the two. I bought one O2 sensor but the plug doesnt fit the O2 by the muffler, but it LOOKS like it will fit the O2 on the cat.
Any advice for a newbie will be greatly appreciated.

brink5 08-19-2013 11:04 PM

I got the up stream O2 sensor changed out tonight. Have to wait till tomorrow to see if that fixes it... keeping fingers crossed!

brink5 08-26-2013 02:01 PM

Good news guys. Problem is fixed!
Could kick myself though, turns out the new IAC I had put in wasn't functioning properly. Swapped out the IAC, and the truck has been running great every since.

Think my problem was I purchased a BWD sensor from oreilly, rather than spending the extra cash to get the factory sensor.

Appreciated everyone's help and insight!

Case closed. :)

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