Last chance for my SVX

Guyver280z · #1 10-24-2007, 12:08 PM

Ok, so far I cant tell what's the problem with my car, already took it to a lot of mechanics and they are clueless, they cant understand why the car runs rough on lower speed but it runs perfect in WOT... so this is the last try ill gieve to my car or Im going end up selling it... im tired of wandering around with no answers

So here are the simptoms:

1.- Sometimes it idles up to 2,000 rpms and it sloooowly goes down to 800 rpms

2.- Sometimes it idles at 500 rpms, but hitting the gas pedal fix it a little.

3.- If Im driving with the gas pedal from 0% to 50% the car feels rough, it jumps back and forth very violent, I hear misfiring on the exhaust (sounds like pof pof pof pof

)But if I press 51% to 100% the car instantly works perfect and runs strong, no misfiring, no rough no nothing.... weird.

4.- No check engine light, it doesnt get hot.

Parts already replaced: Air Flow Sensor (Used but in better shape), Throttle Position Sensor (Used, checked voltage it works perfect).

Subject: 1992 SVX AWD with 5 speed tranny

Addittional info: Somehow my manual tranny is feeling like the clutch was slipping, but its not the clutch, you know.. when I press the gas all the way down the engine starts reving up but you cant feel a consistent acceleration.... then the engine revs down a little bit like it finaly catches up and then you start feeling a consistent acceleration.... Basically it feels like an automatic transmission that's about to break down... but its a manual, funny thing, 1st gear feels strong, 2nd 3rd and 4th feel like slipping. Can manual trannys slip like that?? I know its not the clutch because first I have a stage 2, second it doest slip while starting to move the car, even if I accelerate hard. And usually when I burn the clutch I get this hideous smell, but not when the tranny feel like slipping....

So please help me, Im desperate. I just dont want to go buy parts and parts that wont fix the problem... ans you all know... they are not cheap.

HELP ME PLEASE!!!!

Guyver280z · #2 10-24-2007, 04:04 PM

Nobody??

The Hunter · #3 10-24-2007, 04:29 PM

Email SVXFILES with your symptoms he's a expert on these cars. Maybe he can help.

The Hunter · #4 10-24-2007, 04:32 PM

My guess is a knock sensor but with no light HUMMM maybe your lights burnt out. Also I'd be checking those used parts out.

Guyver280z · #5 10-24-2007, 04:59 PM

Quote:

Originally Posted by The Hunter

My guess is a knock sensor but with no light HUMMM maybe your lights burnt out. Also I'd be checking those used parts out.

Well, the light turns on when I open the switch, so I know the light bulb is working. And I checked the used parts... I mean, I checked the TPS with a multimeter and it worked great, also the original and it was fine. The MAF came from a newer SVX, it is pretty clean and the car shuts down if I disconect it, anyways, I find it hard that it could work exactly the same way as my old MAF.

I'll email SVXFILES, thanks for the advice

Trevor · #6 10-24-2007, 06:06 PM

Quote:

Originally Posted by Guyver280z

Well, the light turns on when I open the switch, so I know the light bulb is working. And I checked the used parts... I mean, I checked the TPS with a multimeter and it worked great, also the original and it was fine. The MAF came from a newer SVX, it is pretty clean and the car shuts down if I disconect it, anyways, I find it hard that it could work exactly the same way as my old MAF.

I'll email SVXFILES, thanks for the advice

Don't panic as the idle issue should no be all that expensive. First things first.

Has all the flexible tubing associated with the inlet manifold been checked for leaks? Have the manifold bolts bean checked, as loose and leaking manifolds have been reported here?

Did you test the TPS and set it exactly in accordance with my instructions in the how too section?

Is the throttle control mechanism working smoothly and such that the throttles are closing exactly and completely, with the TPS moving in unison?

As you describe your other problem, it would appear to involve a slipping clutch. Why are you so sure this is not so?

The more detail you provide the better.

Do not give up, difficult to sort maybe, but fixable.

Myxalplyx · #7 10-24-2007, 06:09 PM

Bad coolant temperature sensor? Does your car run rich when it is running poorly at low rpm? It's not getting hot so. Plus, the rough low rpm driving can be caused by excessive fuel going into your engine.