2000 GP/GT rev limiter causes computer to cut off clyinders from firing

**Bill Blair** · 07-10-2015

2000 GP/GT 3.8 under hard throttle -rev limiter kicks in- preventing cylinders from firing thus engine runs rough -only happens under full throttle. Thought maybe need new flash to computer

**Scottydoggs** · 07-10-2015

maybe your tranny is slipping like a muther? what your rpm's when the limiter kicks in?

or are you flooring it in park, and it cuts out? if so thats normal.

**16MustangVet** · 07-10-2015

Under hard throttle at what RPM? are you actually hitting the rev limiter or what rpm does it do this? I don't get your issue. Need more info.

**industrialfish** · 07-10-2015

I think Scotty nailed it. Trans is starting to go.

**16MustangVet** · 07-10-2015

not enough info to just assume trans is going out.....

**SgtMarshal** · 07-10-2015

I think the guy wants to go faster than 120

**Bill Blair** · 07-11-2015

Originally Posted by Bill Blair

2000 GP/GT 3.8 under hard throttle -rev limiter kicks in- preventing cylinders from firing thus engine runs rough -only happens under full throttle. Thought maybe need new flash to computer

Thanks for all the reply's -I'm posting this for a friend who doesn't have internet service(shame on him!)

By the way he is a 20+ year mechanic -BUT not a tranny tech -this is his wife's car -he is driving trying to figure out what's going on, The rev-limiter kicks in @ 4500 rpm
below 4500 rpm the tranny shifts OK - so the car is drivable -as long as you don't get on it! Even with his mechanical background -he is stumped

thanks again for all the input

**Bill Blair** · 07-11-2015

Originally Posted by 98bleedingaholevet

Under hard throttle at what RPM? are you actually hitting the rev limiter or what rpm does it do this? I don't get your issue. Need more info.

see latest post

**Bill Blair** · 07-11-2015

Originally Posted by ScottyDoggs

maybe your tranny is slipping like a muther? what your rpm's when the limiter kicks in?

or are you flooring it in park, and it cuts out? if so thats normal.

Thanks for all the reply's -I'm posting this for a friend who doesn't have internet service(shame on him!)

By the way he is a 20+ year mechanic -BUT not a tranny tech -this is his wife's car -he is driving trying to figure out what's going on, The rev-limiter kicks in @ 4500 rpm
below 4500 rpm the tranny shifts OK - so the car is drivable -as long as you don't get on it! Even with his mechanical background -he is stumped

thanks again for all the input

**bandook** · 07-11-2015

The rev limiter is programmed into the pcm. Dont see how that would suddenly change. You have other issues, possibly ignition related but hard to say without knowing exactly what its doing. Could be as simple as plugs/wires.

**Scottydoggs** · 07-11-2015

if a 20+ year mechanic cant figure out it needs a tune up, oh boy o boy.

ask the guy if the check engine light flashes when he floors it. that means misfires, clogged cat, or its in need of a tune something fierce.

**SgtMarshal** · 07-11-2015

maybe its one of those things where the spouse is saying: "honey my car is broke." and the mechanic asks: "what is wrong with it?" and the reply is something ambiguous.

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