Engine running rough

[hatch87]

1987 with a 350 tbi
It gave me a short code about a month ago (24) and 44 I believe. One is the TPS and the other is running lean. About 2 weeks ago it was running good and fine and once it got warm it became choppy under load and once it got warmer it was choppy any time you gave it gas. Put a new fuel filter in it and injectors and rebuilt the TBI and cleaned it. Put it back together ran fine for an hour and it began to do the exact same thing now. Installed a new TPS after getting another code 24 and that didn’t help. It is now giving me a code 12 so I put a new coil on it that didn’t help. The code 12 the distributor not communicating with the ECM. All said and done now fuel pump is not pumping any fuel at all. Any thing would help thank you all

 

[gmbellew]

Code 12 is the "all good" code. Any blown fuses? Particularly ECMB?

 

[fast 99]

Fuel pressure? Should be 9-13 although I have seen GM TBI that ran poorly at the lower spec.

Check grounds.

Please do not toss any more parts at it. Part quality is poor. It is possible to create an additional problem and make diagnosis more difficult.

 

[hatch87]

Even with the check engine light still on? It’ll go through it’s codes blinking 1 then 2 times

 

[fast 99]

Code 12 indicates there are no stored codes. If present, system will flash codes from the lowest number first. You probably inadvertently disconnected the battery.

 

[hatch87]

I did change the battery out but the check engine light is still on

 

[gmbellew]

If the check engine light is still on, there should be a code stored. It will flash 12 three times, then each code three times, then 12 three times again.

 

[hatch87]

Yes and when it does that it flashes 12 but I could be mistaken it may not be doing it when it’s running it runs so rough I may not notice

 

[fast 99]

Check engine light on has stored code. Doesn't need to be running to retrieve code. Will be stored for around 50 key cycles if it doesn't re-occur.