StonersTA

Hello Everyone,

I recently purchased a 87 GTA 305 TPI 5-speed from a local auction. The car was not in running condition when I got it. I found out that all that was wrong was the fuel pump. Once I changed the fuel pump it fired right up. The smell of the gas fumes were horrible and I could tell that this car had been sitting for a long time. It will not hold an idle when I start the car, if i hold my foot on the pedal and let it warm up it will purr at 900-1000 rpms. My other f-body is a carbureted car so im new to this TPI stuff. Any one out there able to help?

lonestar7

iTrader: (1)

If it's been sitting for a while, it could be a lot of things. The first thing I would suspect is that the injectors may be clogged up or sticking. I would also check for cracked or loose vacuum hoses. If you do a search here for "rough idle" you'll find a lot of past discussions on the causes and fixes for the problem.

ImBrandon

Put some new gas "premium." A quick tune up; plugs, wires, distributor cap, change the oil and coolant flush. Then go from there.

StonersTA

Thanks guys. I have changed the plugs and that seemed to clean up the miss but not the rough idle. I will get some new high test gas and put some fuel injector cleaner in the tank and see if that cleans it up.

EvelBist

iTrader: (1)

if you can hold the idle with your foot, try adjusting the TPS. Also, i'm not sure if you have a Cold Start Injector, but if you do, search for topics covering that thing.

StonersTA

Now when it comes to adjusting a Carb im fine, but you suggested adjusting the TPS. How do you adjust the TPS. Also it holds a good idle where it should once its warm so if I adjust the TPS wouldnt it screw up once its warm and be too high?

lonestar7

iTrader: (1)

There is a tech article about it here:

https://www.thirdgen.org/tpimod2

If you do a search here on "tune up", "idle adjustment", and such you can find a lot of past discussion on the topic.

2012sergen11

iTrader: (1)

I am having a similar problem and found a kit to delete the 9th injector all together. Won't doing that make it impossible to start normally?

Tuned Performance

iTrader: (92)

if you delete the ninth injector enrichment you will need to have your memcal reprogramed to 89 tpi maf $6e mask.

2012sergen11

iTrader: (1)

Being new to fuel injection mods where can I find out about learning to burn my own proms and make modifications to the computer when I put engine upgrades in?
thanks

Tuned Performance

iTrader: (92)

Read the stickies in the DIY prom section or contact me for reprograming

Barlow8869

iTrader: (1)

i know this is an old one, but ... from what i have read, the cold start injector has nothing to do with the cold idle, and only comes on when the key is in the start position under 95 deg ... i am also having this cold idle trouble, did it ever get fixed, and if so what was it

StonersTA

Barlow8869, No I never did completely fix this problem. as mentioned at first in this thread, I just did your routine tune up (plugs, wires, air filter, cap/rotor, fresh gas w/additive) and it cleaned up most of it.
The only reason i haven't went crazy and made sure everything was perfect is, I plan on doing a motor swap this summer rather put my money into getting things I need for that.
Sorry I couldnt be more help, best of luck though!