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Stalling after decarb

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Old 08-04-2012, 08:05 PM
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drunkbaby
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Stalling after decarb

I picked up an '04 with ~100,000 miles 2 months ago, and it seemed to drive well when I gave it a test drive; it also had an engine replacement at ~55,000 miles. Almost immediately, I've been having trouble with a real rough idle and seeming power loss after the car got warmed up. To troubleshoot these problems, I've done all of the following, in chronological order:

  • Replaced plugs, coils, and wires with OEM replacements.
  • Cleaned the MAF/ESS with electrical contact cleaner.
  • Replaced the entire SSV assembly with the upgraded one; the actuator was broken and tapping really loud.
  • Replaced the cat with a BHR midpipe.
  • Replaced the air filter and cleaned the throttle body tube. It had small pools of oil sitting between the grooves of the accordion tube.
  • Ran the decarb treatment by sucking seafoam through the intake nipples.
The last 2 steps I did at the same time.



After I decarbed and blew all the junk out the exhaust, my car won't even try to idle without stalling. I managed to get it out on the highway and drove for 20 miles, but it still stalls without even trying to idle when I got home. It seems to drive fairly well, though with no real noticeable improvement from before. I don't have any hot start issues, nor do I get any CELs.


I'm really not sure what to try now... what could be causing it to not idle, but yet seemingly run normal?





Old 08-04-2012, 08:08 PM
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Check your plugs.
Did you unplug the battery at all?
Old 08-04-2012, 08:30 PM
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I replaced the plugs 600 miles ago. Do you mean check if they're fouled, or check the connections?

I did unplug the battery prior to starting, and I reset the ESS position via "break stomping". Verified by the oil pressure gauge sweeping. I also reset the steering angle sensor.
Old 08-04-2012, 08:35 PM
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Decarbing the engine with fresh plugs is not recommended.

Unplugging the battery resets the ecu. Your engine is likely trying to relearn the fuel trims, which will take approx 4+ drive cycles. This can cause poor idling.
Old 08-04-2012, 08:56 PM
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Alright I'll keep that in mind, thank you.

Also, it's not that it's just poor idle; It doesn't even attempt it, the rpms just drop off and it stalls. I also took it out of gear on the highway and it stalled in the same fashion.

Edit: Also wanted to note, I disconnected the battery twice before for repairs and it never had this issue.

Last edited by girth; 08-05-2012 at 01:39 AM.
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