Junior Member
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Join Date: Jun 2012
Location: Washington DC, US
Posts: 3
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Junior Member
Join Date: Jun 2012
Location: Washington DC, US
Posts: 3
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Cold start issue
I have 2004 4Runner 4.0L that has a cold start problem while warm start is OK. Every morning it took 4 to 6 cranking to get it starts, sometimes I am afraid it will damage the starter or flywheel doing that. After many times scanning the engine with portable ODB scanner it gave false reading as P0351, P0352 to P0355 (not P0356). I replaced, swapped the ignition coils, clean the MAF sensor, installed all new spark plugs but still have the same cold start problem. Last week my mechanic scanned the engine with his $10K scanner and found no DTC code other than P0351 (false reading again?), it detected no sensor error.
Yesterday, when the outside temp is around 45 degree, I got in the car and waited for my wife, I turned the key to to ON but not starting the engine. After 4 minutes my wife got out of the house, I then cranked the engine, holly molly the engine started immediately with one crank, I did not have this in the past 4 weeks. This tells me the code P0351 (primary/secondary circuit) is false again as this is not electrical, ignition problem, right?
I think there is a problem with fuel or air or vacuum mixture but I have no clue. there is no misfire, no hesitation, still drive strong, that is how it gets me hard.
For now at least I can bypass the cold start problem but I'd like to find and fix the issue since winter is coming hard soon. Is it Throttle issue, Coolant Temperature Sensor issue, or else? The bottom line is the car runs well, only cold start issue, warm engine starting is fine.
Please help!
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