I have a 88 TII and the other day i took my ac out. Every since my car wont go past 5,200 rpm, it just stops. But if im in neutral i can go to 7,000 all i want. The weird thing is that yesterday i tryed WOT and i got it to redline 2 times in a row, but after that it stoped at 5,200 ever since. If anyone has seen this problem before or has any input it would be apreciated, and id like to ad that it isn't fuel cut, it isnt violent at all it just stops reving.

thanks

 

i don't know if this will help, but i had a tps on my gtu one time that wouldnt let it go over 5000 rpm. i wouldn't think that removing your a/c would cause this problem, it's gotta be something else.

 

wow, I'm completely clueless, I'm guessing here, but it could be the ecu? It could be a lot of things... yuk. I have a similar problem but it's got a pattern to it. whenever I sit somewhere and idle for a while (maybe 10-20 minutes) with the a/c on, it gets bloody hot under the hood (stock temp guage indicates normal temps), and I can't rev it beyond 1500rpm in gear, or 3000 out of gear. It acts just like a rev limiter. we might have similar problems?

 

maybe a boost leak? does your boost drop? check that and see...thtas my guess

 

i also had a problem on my 87 t2 when i got hot it would hesitate and do the bucking thing. turned out it was the fuel pump.

 

I say a boost leak.

 

i just read his other thread, could be boost leak since he removed some intake hoses.

 

if the only part of the intake you left off was the snorkel that wouldn't have any effect on how high it revs. and if you didn't disturb/remove any intercooler hoses/tid there really shouldn't be a boost leak because it would have been leaking before you removed the a/c

 

we didnt mess with any IC piping at all, and would boost leak cuase my car not to move above 5,200 rpms under load??

 

Its also not a constint rpm that it stops at. like 1st gear its around 5,000. second its 5,200 and 3rd its like 4,500(havent tryed anyother gears). if that helps at all. Think it could be a ignition coil?

 

boost leak or your injectors are very dirty and need to be cleaned professionally. I had the same problem in 4th gear at 6500 rpms, and it blew my engine up after the 2nd time due to leaning out.

 

Yes, I had the same problem. No boost leak until under load/boost and then I couldn't get any power and couldn't get the car to rev even.

 

Thx everyone for your help. But tonite i was coming home from work and it got to normal temp and i decided to try and boost it, and i redlined. I was like wtf, so i did it again, and 2 more times i got it to redline. but the next time it did the same thing, and i notices that my engine temp got pretty hott. you think by taking off that shroud and intake stuff(except air box) has made the air to hott and my car just not wanting to go past a certin temp??

 

are you running the stock clutch fan and no radiator shroud? if so you really need to put the shroud back on, because it will overheat in traffic w/o it. the snorkel you took off really has nothing to do with it.

 

if it is a boost leak and it's doing it when it's hot, it means whatever is leaking has to get hot before it opens up and causes your problem.

 

im putting the shroud back on tomarrow, but do you think thats the reason why its stoping at certin rpms?

 

And it dont feel like a boost leak, ive felt boost leak befour and its nothing like this, the car just stops.

 

the fan shroud probably isn't causing the problem, but you need it on there anyway if you're using the stock fan. w/o the shroud, what's the point of having the fan?

 

I have a feeling it has to do with temperature. It could be the temp sensor for the air intake, or something in the ecu that senses oil/coolant/air temperature and puts a rev limit accordingly. It seems odd, but the way it sounds (and acted for me) it's possible.

 

as posted already it's most likly fuel cut from too much boost..... since you already have an exhaust and just opened up your intake a bit more. just wait a few more days and stick your boost gauge and FCD on when you get it.....

or put your shroud and intake pipe back on and see if it still happens.

and stop making more threads on the same problem.

 

he should be telling us what his stock boost gauge is reading when it's doing it. and he said it wasn't a violent stop, like fuel cut, which will throw you forward.

 

does it happen in every gear? if it happens in every gear at 5200 then it's not fuel cut. proably only in 4th maybe 3rd for fuel cut....

 

hey scott where did you get your front lip from?

 

I have a FCD on so its not fuel cut. But i put the shroud on and stock intake and it stoped ! so it must of had somthing to do with temp or something else. but thx everyone for your advise!!!!

Cowzzz

 

hmm, it DOES have something to do with heat then..... mazda put some extra underhood heat protection we don't know about, maybe? Well, it feels sure as hell like a fuel cut to me, it lurches as if I let off the gas all of a sudden with the clutch engaged still....