Forums/Z31P/z31-repairs-forums engine-mechanical/86 NA won't idle
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Sir SniipesAlot: (2019-01-27 22:27:18)
Hello, was wondering if maybe I could get some insight on my situation here. I recently bought an NA 86, it had a blown transmission. I've since fixed the transmission. The previous owner said the only known issue when he parked it was the transmission, and he's a friend so I trust his word in that regard. The car will now start on it's own but will not idle. I can hold the throttle and keep it alive, but running rough. I've replaced the battery, plugs/wires, air filter, distributor assembly, fuel pump/filter, TPS, and MAF. I think the problem is related to the MAF somehow, because I can unplug it and the car will idle for maybe thirty seconds before dying. The codes I ran before replacing any parts were 41, 23, 31, 13, and 11.
After leaving the battery unplugged for a few hours, I attempted to start it again after replacing all the parts. The ECU ran these codes:
12 - Air Flow Meter (MAF) (new one could be bad?)
13 - Cylinder Head Temp
23 - Throttle Valve Switch
31 - Load Signal Circuit (the power steering is out, I'm assuming this is the code for that)
32 - Starter Signal (starter works fine?)
41 - Fuel Temp Sensor (the cord is cut at the sensor, but I've read you can delete it anyway)
Any help is appreciated
albionwanderer86: (2019-01-30 01:02:45)
I would take a second look at your MAF sensor and TPS, since you replaced both. Make sure you are positioning the MAF with the correct flow. It sounds silly, but it happens. I myself re-installed my MAF backwards on my Z, and didn't notice for several days when I actually went to drive the car. I also see you replaced your distributor assembly… double check your timing and make sure you aren't off a tooth. The VG30s are notorious for cold starting issues due to bad cylinder head temp sensors, so that could also be a corresponding problem.