Rough Idle and stall on cold start
#12
Junior Member
Thread Starter
Join Date: Sep 2017
Posts: 23

I noticed a pattern. It starts perfectly fine on cold mornings. The fuel trims are way negative, indicating a rich condition which the computer is compensating for. -15% and -19% on each bank.
Will be changing fuel pressure regulator this weekend.
Will be changing fuel pressure regulator this weekend.
#13
Junior Member
Thread Starter
Join Date: Sep 2017
Posts: 23


Fuel pressure regulator was the problem. Starts smooth and idles fine now.
Better fuel economy and smoother engine.
#16
Senior Member
Join Date: Sep 2013
Posts: 248

If the fuel press regulator doesn't correct the problem, consider the crank sensor.
Here is why;
A malfunctioning crank sensor "Does not throw a code" !
If everything else checks out , smart move to change it.
Here is why;
A malfunctioning crank sensor "Does not throw a code" !
If everything else checks out , smart move to change it.
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