Easy exhaust Question, please enlighten me.

[iruyle]

Hopefully an easy one this time, no remote psychic-diagnostics required...

So...
Picture an 89 turbo automatic. Open the hood, nice clean 7mT. Radiator is nice and full, oil cap is devoid of anything milkshaky in nature. Also a cone intake and a MAF Translator. (Too dark to inspect the MAF, so i just don't know if its stock or not.) Start it up, idles magnificently but the roaring sound underneath leads you to look under the car and you see that the entire exhaust has been removed from the cat back.
You want to see how it shifts so you take it out of the parking lot. About 75 yards down the road, lots of choking sputtering, slow down and a fair amount of fuel-scented smoke. It will barely move under its own power. Turning back, limping it along, it feels very much like it is bumping the rev limiter at about 2800. Park it, shut it down, start back up without a hitch and silky idle once again.

Question: could the lack of the catback have an effect like that or would it run normally but loudly?

 

[SideWinderGX]

Catback has nothing to do with that, it would run normally but loudly.

Something is most likely wrong with the CPS or the MAF translator.

 

[iruyle]

I assumed so, that's why I took it on the road in the first place, was just kind of hoping it was that easy to pinpoint. Crud!

 

[1988ma70supra]

Like stated above. The lack of a catback wouldn't change anything. Sounds like when the AFM element gets dirty or damaged

 

[iruyle]

Like stated above. The lack of a catback wouldn't change anything. Sounds like when the AFM element gets dirty or damaged

Thanks,
I'll take a look at it in the daylight tomorrow and see what im missing. I just can't believe its anything catastrophic with the motor as smoothly as it idles. Hoping to find a simpple crap AFM or wonky ECU. Something. Fingers crossed.

 

[planemos]

Pull out the CPS and re-install it following exactly how the TSRM describes you to do it. Make sure you get it right. It is actually pretty hard. Check with a timing light. Set your TPS also. It is fairly difficult to get correct also. Follow the TSRM you will need a voltmeter.

 

[Rollus]

Hi

Check out the output wire of Maft

Here is wiring of the Maft Pro



Envoyé depuis mon GT-N7100 avec Tapatalk

 

[IndigoMKII]

Any codes? Very rich and massively slow combined with 2800 'rev limit' sounds like a knock sensor..

 

[iruyle]

Any codes? Very rich and massively slow combined with 2800 'rev limit' sounds like a knock sensor..

got my trusty paper clip.
im heading back over to take a look now and see if there are codes.
also, i noticed last night that the fuel filler door wasnt closed. given the state of the car right now, it may not even have a gas cap on and we had a ton of rain over the new year weekend. super low fuel level too so might be water in the tank? still hopeful that its something easy. the car was suposedly running great within the last couple of weeks.

 

[Backlash2032]

Never had any of those symptoms when I got a code 52. That's is, except massively slow. I would be willing to bet my old tired n/a would blow the doors off of it.

Sent from my terrible HTC Rezound using Tapatalk. Don't buy HTC...

 

[IndigoMKII]

code 52, knock sensor, pulls timing and adds fuel to compensate for anything that could be happening to the engine.

 

[Backlash2032]

Well my car still ran perfect. It may have been rich, but no where near what the op is experiencing.

Sent from my terrible HTC Rezound using Tapatalk. Don't buy HTC...

 

[planemos]

The fuel tank has a big allen head bolt on the bottom of it. Very easy to drain. And the knock sensor re wire is cheap to do. You just need some communications wire it is easy to come by. The stuff with shielding around it. Then you ground the shielding right at the kick panel by the ECU.

 

[Backlash2032]

The fuel tank has a big allen head bolt on the bottom of it. Very easy to drain. And the knock sensor re wire is cheap to do. You just need some communications wire it is easy to come by. The stuff with shielding around it. Then you ground the shielding right at the kick panel by the ECU.

Everyone always told me it was a mess to drain with that.. I got all of it in a 5 gallon bucket. No mess at all. And it isn't an allen head. You just need a 3/8ths inch drive ratchet and that's all.

 

[scottiedawg66]

Well my car still ran perfect. It may have been rich, but no where near what the op is experiencing.

Sent from my terrible HTC Rezound using Tapatalk. Don't buy HTC...

This was also my experience with code 52 both 7m and 1j. Car ran fine until applying 75% throttle or so, the it was just really slow.

 

[IndigoMKII]

Odd, mine did not want to go above 2800-3k at all and poured black smoke if I tried to keep up with traffic.

 

[supraguy@aol]

Did you investigate this car any further, Iruyle?

 

[Backlash2032]

Did you blow off an intercooler pipe? That sounds like what mine did when I blew mine off.

Sent from my terrible HTC Rezound using Tapatalk. Don't buy HTC...

 

[iruyle]

Did you investigate this car any further, Iruyle?

Not sufficiently. Bad starter connection prevented pulling codes on Saturday. Haven't finished work before dark to check piping. Will know tomorrow afternoon.

 

[iruyle]

Did you investigate this car any further, Iruyle?

CODES 24 and 34. Tried to close up the intake as well as possible. Not worried about the ecu or maf since I can always happily return to stock but the lingering doubt about the health of the turbo is probably enough for me to keep looking for another one.