what would make my car rev slow?

 

To high a gear. Not enough power. Extremely heavy flywheel. When exactly does it rev slow?

 

try doing the tb mod . like in the post above when exactly is it revving slow?

 

yea tb mod will help. maybe ported the tb also. do u have a 3800 hesitation?

 

ported motor will help that too!

 

Your secondary throttle blades may be stuck closed.

 

I did the tb mod and the motor is ported it does it all the time. Ill hold in the clutch and give it gas and it only revs to about 3500 then it starts backfiring and wont rev to much further.
thanks

 

clogged cats can also cause slow revving

 

bad secondaries injectors... not opening 5 and 6 ports...clogged cats.... stuck secondary throttle plates..but by the way u say it backfires.. i would have to go with bad secondary injectors or not enough gas...

 

Bad ACV can cause the backfire, but not slow revving (i think)

I would check and refurbish your whole 6port/vdi system. ie hoses, actuators, solenoids, etc...

 

Do your idiot lights workk? Can you check your error codes? You may be in "limp home" mode which fits your basic symptoms. It's a long shot but worth a check. Just ground the little one wire green plug located near the leading coil and turn the key to the "on" position. Count the number of times the check engine light blinks noting short and long pauses. And come back here and let us know what you've seen. Or you can search on here to get the error code list. Main reason for "limp home" is a faulty OMP.

 

Ok Ill try that


My cats are gutted, I installed 720's after this happened and I still have the same trouble.

any other suggestions, or things I can try

thanks

 

^

 

check your compression... sounds blown if it won't rev with the clutch in...


does it idle?

 

It idles at like 1500 or highter if it idles at all.


I did a compr. check about a week ago and it was good but since then I found that only one of the oil injectors was getting any vaccume, before I noticed this I drove it about 3 miles because I had just put silicone hoses on it.
could this cause the motor to blow that fast.

The car had the same rev problem before I did the hoses.

thanks

 

^

 

Have you checked the turbo?

 

The turbo is fairly new i dont think thats it what do u think is wrong with it

 

Bad*wrong* timing. The throttle body mod, a corrupt tps, secondaries will not cause this by the way(in the driveway), fuel starvation. Darn wires being on the wrong plugs, apex seals, One of the PRIMARY injector wires broken, Primary injector wires on the wrong injector, one very bad LEAD spark plug, the rag that you left in the intercooler and twelve dozen other things.

I'd check the timing first, put two new LEAD plugs in, check the tps for ohms valve as the tps is run thru its full range, and think of whether or not I'd been under the intake prior to this problem to answer if the injector plugs might have been swapped .

 

what could be wrong with the tb mod

 

Dare I say you took out the wrong plates. Did this problem start right after you did the TB mod?

 

?

Press on the accelerator pedal? hehe j/king man!

 

never done the tb mod, but i did notice a little quicker responce with a electric fan

 

vanix......my sole purpose on the face of the earth is to let people know that THE OIL INJECTORS DO NOT GET VACUUM. The oil injectors are the ones causing the vacuum. They, the oil injectors, suck. They suck fresh air from a passage inside the throttle body, that leads to the front of the throttle plates. Therefore if the "vac" line on a oil injector falls off, there is no problemo. Its still sucking air. Just not filtered air. Not the cause of your problem in any way.

Note: the suction is from the rotors side of the oil injector.

 

Thanks for the info, if I am incorrect with any of my other information please let me know