99 ram 1500 5.9 high idle

Asked by GuruC58B2 Feb 06, 2019 at 07:51 PM about the 1999 Dodge RAM 1500 ST Quad Cab 4WD

Question type: Maintenance & Repair

I bought the truck and it wouldn't idle at all
hardly so I replaced the iac. Idles now but
was way too high. On average around 1100
to 1200 in park. And 900 to 1000 in gear.
Also replaced the tps after I got a check
engine light for it but no change in idle. Every
once in a while it will idle normal but it is very
very rare.

4 Answers

43,800

Scan again and make sure you got all the codes fixed. Look for a massive vacuum leak at the intake manifold and all hoses. Then disconnect the battery to reset computer. Then after a few drive cycles it will "relearn" it's normal idle speed....hopefully.

1 people found this helpful.

No other codes and I've sprayed all hoses and intake manifold with carb cleaner. No leaks found. And reset learned values with Snapon versus pro.

Those r@ms have pluntum problems the steel plate warps and leaks oil in into the plentum they make a kit to buy 150$ With a new alunimum plate for it that could be one of the problems you might be haveing?

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