89 7mge revving problems

[88supraFAST1]

I have an 89 cressida and im having a problem where it wont rev past 4k i have no check engine lights nothing i have been working on it for a few weeks now trying to figure out what is wrong but cant find whats wrong. I hoping some one on here can help me out. Thinks i have check wires cap rotor plugs and wires, tps, afm, fuel filter, everything was good and with in spec.

 

[hvyman]

any vacuum leaks?

 

[88supraFAST1]

no none that i could find i looked and used propane to hunt them down but couldnt find any.

 

[AJ'S 88NA]

Checked your timing? Both, cam and distributor? How old is the timing belt?

 

[88supraFAST1]

i have checked the timming a million times timming belt in 5k old.

 

[88supraFAST1]

bump im still stumped

 

[88supraFAST1]

bump

 

[AJ'S 88NA]

Just noticed you said "no check engine light". Did you check for codes with the jumper wire?

 

[lewis15498]

are we talking free revving or while driving, if its while driving its could be a transmission issue. Free reving maybe bad ecu?

 

[supraduper]

definitely check the air gap in the distributor.... along with compression tests

 

[88supraFAST1]

There is no codes and no check engine light, it is both at free revving and while driving. what do you mean air gap. i am going to do a test tomorrow.

 

[supraduper]

the air gap is the space between the magnetic pickup and the reluctor.. i dont know off hand what the spec is, but its in the tsrm i am sure....

you will need a set of non magnetic feeler gauges..

and are you sure you have propper fuel pressure....

fuel would be the most likely culprit..
but with an old worn out distributor... the faster the reluctor spins and the increase in space to the pick-up.. the harder it would be for the pickup to "sense" the rotation...

its a thought

 

[88supraFAST1]

thanks for the input i will look the dizzy

 

[ricerkid]

it sounds like the maf sensor is kaput to me. I had the exact same problem with my 7mge; it wasn't throwing any codes. Check the resistance on your maf sensor. I bought a remanufactured one at autozone for $180 which isn't too bad in my opinion, also your local breakers yard might have one.

 

[AJ'S 88NA]

AFM? GE's don't have a MAF. Post in the WTB section if that is what the problem is.

 

[ricerkid]

oh my bad i meant AFM. anyway it fixed my revving problem

 

[BlackDynamite]

Well, when i bought a re-manned distributor for my old worn slap out one, it wouldn't let me rev past 3000 rpm and would bounce like rev limiter. So i just put old one back in and it worked fine. same timing and everything. I was about to say it was your mas or your TPS.

 

[cuel]

Might check your fuel filter. It gets plugged up enough, you won't get enough fuel. Air filter as well, but it would have to be REALLY bad. K&N filters that don't get cleaned are bad about that...