dlong83

My 91 4.0 had some serious problems reving got better at higher rpms and if I let it run all day while on the trails so I replaced my map sensor and made a lot of difference but still have hesitation when reveing gets better at high rpms still. But map sensor did make a word of difference. What else should I check

dlong83

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dlong83

And it won't start unless I have the pedal to the floor

1976Mustang

Fuel pressure good?

dlong83

Yep. After some research it ended up being the temp sensor. Still takes a bit for it to start

dlong83

Any body got a ifea

salad

Try posting in English for better results. What is the problem exactly? And didn't you just post that the CTS fixed whatever was wrong?

RTorrez1

I thought that I read that too????

scottmphoto

Hesitation and not starting unless the pedal is to the floor sounds like the throttle position sensor. Check it out, rule it out and go from there.