Help! Engine suddenly quitting!
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Registered User
Joined: Feb 2018
Posts: 12
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From: Sc
I’m waiting on some new leads for my multimeter to come in later this week but until then this evening I miss around with the truck some more. When I first start the engine it will idol around 1000 RPM and then when I put in drive and go for a little bit it runs fine but when I let go of the gas pedal the RPMs go way down in the engine dies then it won’t start again unless I’m pushing down on the gas pedal slightly and I have to keep some constant pressure on the gas pedal to keep engine running. I will test out the TPSwhen my leads come in but do I need to check the idle air control valve? I looked inside the throttlebody and there is hardly any build up but there is a little bit of oil?
Amateur
Joined: Jul 2017
Posts: 35
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From: Montana
I would definitely check the IAC. I've got two suspects: the TPS or the IAC. The IACs in my opinion are a little shawty- especially the none OEM ones. Their easily faulty and flimsy, the spring has a tendency to work the metal pin/shaft loose (the male piece inserted into the back of the throttle body)- I've seen it happen before and if it's happened then your not getting an adequate air supply to the tb. It's hard to tell unless you have a new IAC to compare lengths but if you take five mins to unscrew it and snap a good profile shot and post it i can get a better idea of it that's the problem.
Veteran
Joined: Nov 2017
Posts: 488
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From: Texas
If nothing else here works, then try removing n cleaning or replacing the intake air temp sensor. When dirty, it sends a false temp code to the ECM n the engine runs too lean or too rich n drives the IAC crazy trying to compensate. It's a simple/easy and super qwik test. If you got something to clean it with , a wrench n approximately 15 minutes...it's almost easier than calling GEICO to save 15%!
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Registered User
Joined: Feb 2018
Posts: 12
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From: Sc
Thanks to YouTube I got the throttle body cleaned out and I went to head and ran by Auto-Zone and replaced both the IAC and the Tps l. While reinstalling everything the vacuum hose broke on both sides of the check valve, I have some more vacuum hose but which direction is the check valve supposed to be allowing air to go?
Last edited by jimbanjer; Feb 6, 2018 at 06:26 PM. Reason: Auto correct mistakes
Administrator
Joined: Apr 2010
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From: Clayton MI
Also, don't expect that aftermarket IAC to work as well as the stock one...... I had one in my truck for a couple months, and had occasional stalling issues, no codes. Replaced it with a mopar spare I had layin' about, and the problem disappeared.
Bottom of the manifold looks wet....... Time to fix the plenum?
Bottom of the manifold looks wet....... Time to fix the plenum?