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Won't rev past 3500rpm

Car: 1995 Cavalier 1.8 Problem: as subject line. In neutral or in gear, extremely reluctant to rev past 3500, hesitant rather than misfiring, almost like a rev limiter. Bad when cold, gets better when warming up, not bad at all when full temp. Have changed fuel and air filters. Have checked for vacuum leaks and splits in the air hoses. Cold/hot air flap in air filter box works as it should (closes off cold air inlet when started from cold).

Not sure where the air temp sensor is - anyone? Would a faulty air temp sensor cause the above symptoms? There's no hint of anything wrong below

3500 rpm.

Ta

Pete

Reply to
PM
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Blocked exhaust / shagged catalyst.

Ta, G.

Reply to
G-Man

Collapsed Cat or exhaust blocked in another way.

Tim..

Reply to
Tim..

it might be worth checking cam sensors etc. i had a similari issue with a cavalier SRI, where it would go into limp home mode and be extemely hesitant and rev-limit at around that speed. in my case i had a dodgy connection at the cam sensor which could be temporarily rectified with a wiggle.

hope that helps

Reply to
<dan

Some people just love their cars too much.

Reply to
Johannes H Andersen

Tim (& G-man who suggested the same): Would this be temperature dependent? The car is OK at full temp, just bad when cold.

Thanks

Pete

Reply to
PM

I'll give it a look, thanks Dan. The EMS light doesn't come on though.

Cheers

Pete

Reply to
PM

i was thinking on the lines of a tight engine when cold or lack of oil circulation (wrong viscosity - too thick when cold) , but i wonder if it would reach 3500 rpm in that case

Reply to
beerismygas

Plugs & Leads?

Pete.

Reply to
Pete Smith

Can't see/hear any tracking, also plugs/leads tend to be worse at lower revs...

Reply to
PM

FWIW: Problem: duff O2 sensor

Reply to
PM

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