90 TGP with a few problems

[woodsbuggy]

Hello All,
I recently purchased a 90 black TGP. The car has 140K miles but appears to be in good condition, it is rust free which is rare for Indiana.
The car idles rough and wants to die at a stop, it also shifts up and down at part throttle in drive between 30 and 50mph.
I have owned the car less than 2 weeks, the only driving that I have done is the 2.5 hour drive home.
I have searched for a vacuum leak but have not found one yet.
The crosover pipe was replaced by PO.
Fuel pressure is 42psi with ignition on not running.
FP is 40 at idle but drops to 35 by 2500 RPM.
I plan to replace fuel pump and check injectors.
Any Suggestions on other things to check?
I will looking for a TG160 chip as soon as I am able to fix the current problems.
Thanks
Woodsbuggy

[TGP5sp90]

I do wish you the best of luck finding a TG160 chip for sale. However if you would like your own chip made for your car try RobertISarr and see what he can do. If your positive on no vacuum leak then your chip could be the issue on the rough idle, also along with having the rough idle would relate to the transmission shifting. Definitly hope this can be a quick fix for you.

[EMNCFI]

I would be willing to bet if the original multitech fuel injectors are in there, at least one of them is bad

[Garrett Powered]

a datalog using tunerpro 5 can be posted for viewing by others and pointing out anything obvious to why it is stalling. having the ability to burn your own chip would be helpful to anyone owning a tgp.

[woodsbuggy]

Thanks for the input,
As soon as it warms back up here it will get back to working on the car.
I will check injectors and then do some data logs after I get a cable for my laptop.
I am always looking for info to help my car run better.
Thanks Again
Kenric

[woodsbuggy]

I finally had a chance to work on my 90 TGP tonight. The cooling fan would not turn on, even when my temp gauge reached 240F, I shut the car down at that point. All of my fuses and relays look good.
Also the car would not rev past 3500 RPM and it was running very rough.
Thursday night I will be changing the plugs, wires, and coolant hoses, and inspect/repair the vacuum lines and installing a BOV. I still need to get a cable to connect to my laptop so I can datalog and see what it is going on.
I am leaning toward fuel pump and injectors, what have you seen?
Thanks
Kenric

[GOT2B GM]

Sounds like it could be a bad coolant temp sensor, would explain fans not running, and would cause it to run really rich (rough) as well.....does it smell like raw fuel when its running?

Does the cat glow at night when running it?

[woodsbuggy]

It was running very rich, I did not drive it just sitting in the driveway. Where is the other temp sensor located, I found the 1 on the drivers side of the rear head and the gauge quit working when I unplugged it. I did not look at the cat, but will have a better chance to look at things Thursday since my friend has a hoist, I just need to get the cooling fan working so I can drive the 6 miles to his house.
Kenric

[GOT2B GM]

coolant temp sensor is located under the throttle body in the lower intake manifold.

[woodsbuggy]

Thanks for the info, is it a 1 wire or several wires? I can get one at work tomorrow(I work at NAPA). The one that I saw had 1 wire, I will look for the other one tomorrow. When does the intercooler fan turn on, is it only under boost or when IAT reaches a certain temp? My intake temp was hot, but I did not see the fan come on, I need to make a heat shield for the TURBO, so the intake pipe does not receive so much heat.
Kenric

[GOT2B GM]

coolant temp sensor should have 2 wires, its been so long since I've had a stock tune on mine that I can't remember when the IC fan is supposed to run.

Mine runs pretty much all the time the car is running under 50 MPH but that's due to my tune.

Factory these cars came with a Turbo blanket made of a fiberglass/kevlar type material.

[woodsbuggy]

Thanks Again, Where is a good place to get a chip? I will make a heat shield for the TURBO and wrap my charge pipe.
Kenric

[GOT2B GM]

The guy who made my chip no longer does it, but there's another guy here goes by flybynite or Turbo V-sick that does them (goes by one name here and the other on tgpforums) His name is Adam.

Don't have any experience with Roberts tunes (RobertSaar) but feel free to contact him as well.

[GOT2B GM]

http://www.w-body.com/member.php/3417-Turbo-v-sick

http://www.w-body.com/member.php/2716-RobertISaar

[Garrett Powered]

one of those PM 3 brake pump heat shields off our cars works good. I had an extra one and stuffed it down over the turbo for a heat shield. my upper intake pipe stays cool to the touch and nothing melts.

if for some reason the coolant is not circulating, from an air bubble or low coolant or something it can do that. or if you have a small leak and can't get full pressure it will not circulate the coolant properly and that may cause the fans to not come on. other than that it may be the sensor.