Terrible idle..
#1
06-20-2018, 04:32 AM
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Terrible idle..
Hello everyone. I have an 04 g35 coupe that idles low, surges, and sounds like it wants to die. Idle is violent like a cammed v8. It drives fine only seems like a small misfire randomly when cruising in town. Accelerates fine or highway is fine. Put in new MAF sensor, crankshaft sensor, TPS, new plugs gapped to .043 NGK coils seem good might order new ones along with pcv. Did the idle relearning but that didnt seem to do anything. No check engine codes now but previously it was the random misfire code. It has a cat delete with test pipes. Would that affect the idle at all with the o2 sensors? Small exhaust like on the Y pipe, didnt affect it before. Any ideas would be great its driving me insane.
#2
06-20-2018, 09:16 AM
Hello everyone. I have an 04 g35 coupe that idles low, surges, and sounds like it wants to die. Idle is violent like a cammed v8. It drives fine only seems like a small misfire randomly when cruising in town. Accelerates fine or highway is fine. Put in new MAF sensor, crankshaft sensor, TPS, new plugs gapped to .043 NGK coils seem good might order new ones along with pcv. Did the idle relearning but that didnt seem to do anything. No check engine codes now but previously it was the random misfire code. It has a cat delete with test pipes. Would that affect the idle at all with the o2 sensors? Small exhaust like on the Y pipe, didnt affect it before. Any ideas would be great its driving me insane.
#3
06-20-2018, 09:21 AM
Registered User
I'm having a similar issue with the random misfire code coupled with occasional single cylinder misfire codes. My car doesn't drive fine at all, I consider it "broken down" as driving it in its current state is likely damaging more expensive components.
I just went though and unplugged each of my coils while the engine was idling one at a time. For 5 of my coils, removing the plug caused it to run notably worse, but for one of the coils pulling the plug doesn't do anything.
Then I swapped coil locations and tested those two again to see if the problem was with the coil or something particular to that cylinder, and the problem (unplugging causes no change in idle) follows the coil regardless of cylinder. Maybe doing this to your car would uncover a problem?
I just went though and unplugged each of my coils while the engine was idling one at a time. For 5 of my coils, removing the plug caused it to run notably worse, but for one of the coils pulling the plug doesn't do anything.
Then I swapped coil locations and tested those two again to see if the problem was with the coil or something particular to that cylinder, and the problem (unplugging causes no change in idle) follows the coil regardless of cylinder. Maybe doing this to your car would uncover a problem?
Last edited by cswlightning; 06-20-2018 at 09:25 AM.
#4
06-20-2018, 09:25 AM
I'm having a similar issue with the random misfire code coupled with occasional single cylinder misfire codes. My car doesn't drive fine at all, I consider it "broken down" as driving it in its current state is likely damaging more expensive components.
I just went though and unplugged each of my coils while the engine was idling one at a time. For 5 of my coils, removing the plug caused it to run notably worse, but for one of the coils pulling the plug doesn't do anything.
Then I swapped coil locations and tested those two again to see if the problem was with the coil or something particular to that cylinder.
Maybe you're having a coil issue as well? It seems like you've thrown some parts at it which is more than I've done as I want to find the problem 100% before buying any parts.
I'm also ge
I just went though and unplugged each of my coils while the engine was idling one at a time. For 5 of my coils, removing the plug caused it to run notably worse, but for one of the coils pulling the plug doesn't do anything.
Then I swapped coil locations and tested those two again to see if the problem was with the coil or something particular to that cylinder.
Maybe you're having a coil issue as well? It seems like you've thrown some parts at it which is more than I've done as I want to find the problem 100% before buying any parts.
I'm also ge
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06-20-2018, 09:51 AM
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06-20-2018, 10:08 AM
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06-20-2018, 08:12 PM
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