Volvo Iac and idle problems. Car wont start or idle without foot on the throttle helping it. Verify 12v on red and black wire at iac, if no power there check fuse 18, if fuse is blown, disconnect pcv heater near turbo and retest(they short out). If power is ok then look for a duty […]

This was an ‘02 Explorer 4.0L with p0401 stored in pcm memory. Quick check the vehicle with a hand held vacuum pump to see if the EGR valve works at all. Simply pull vacuum hose off @ the EGR valve & apply vacuum to see if the motor reacts. If the motor stumbles you know […]

Im going to share this because it took quite a wile to find the answer. If you have the exaust cam out of the head for any reason and it looses oil pressure in the cam gear head DO NOT crank it after new belt install. You have to line your cams and crank then […]

I suspect like many others, I am not equipped to monitor data on these systems, only read codes.
The diagnostic tree has great step by step procedures for checking the circuit to and from the sensor, but unfortunately this isn’t your average wheel speed sensor. The resistance of the sensor is very high (300-500 Mega ohms) […]

02 Monte Carlo with compressor inop. No signal to relay. I know that Mitchell does not write the flow charts but probably ought to check this one. All the basics good i.e. coolant temp,no wot,p/s signal,yada yada yada. Chart says look at A/C request on PCM data (Ours said NO) Then it says check to […]