car wont started when engine is warm

[92exrkid]

hi ive got a 92 exr with a starting problem thats been happening ever since i bought it last summer. it wont start when its really hot out, the engine is warm and i shut the car off. it can take up to 30 mins to get started sometimes. i change the air filter, fuel filter, checked for spark, ran injector cleaner, cleaned the iac valve and cleaned the throttle body abit. Also sometimes if i turn the key off and back on while this is happening the d4 light will start to blink continuous short blinks until i turn the key off and back on a few times.

im pretty new at this so i dont know what else to do but i would like to learn if anyone could help tthanks

[Jking72]

Check engine light on? Or just the d4?

Count the blinks, there reallywill be long ones ffirst if any then short, then it will repeat.

Or you could record it with a camera or smartphone and upload it and share it with us to see.

[92exrkid]

only the d4 light blinks no check engine light. i tryed counting the blinks before. it just flashes short blinks repaetedly i counted up to 40 something and lost count it just keeps going

[STOCKa6]

Commonly our cars wont start when its hot out due deffective soldering on the main relay, replacing that will fix it. It is also possible the main relay will fix the D4 light, though I found that when I had an issue with my TCU, hot weather made it act up. Could be the beginning of the end for the TCU(another common issue)

[STOCKa6]

Also are you sure its in diagnostic mode when you check the codes? the constant blinking if the D4 light, is just how the TCU displays that there is a problem and needs service.

[92exrkid]

ok thanks i was doing some research on how to repair the main relay if i need to. so i guess my car was just indicating a problem with the tcu. i remember a mechanic pulled some codes out of the car awhile back and wrote them down for me.

03 TPS open or short
07 SS A open or short
08 SS B open or short
14 FAS wire open or short

are any of these things i can possilbly fix or get fixed for a relatively cheap price? appreciate the help

[wildBill83]

I would open and inspect the TCU for burned components and swelled caps.

Those codes are not TCU codes. Reset your ECU and try and jumper the diag port and see if they re-appear after 30 minutes of driving and 3 restarts.

Also re-soldering the main relay takes 10 minutes and is cheap insurance.

On top of that the mechanic was wrong about what the codes correspond to. Don't go back to that mechanic.

03 - MAP
07 - TPS
08 - TDC
14 - IAC

[92exrkid]

Thanks wild bill for the advice on the main relay and inspecting the tcu. So are these codes I have here are for the ecu? Is what you have wrote down there the correct diagnosis of the codes? Thanks again and I'm not going back to that mechanic!

[deevergote]

All codes, as well as the proper procedure for checking them, can be found in the thread at the top of this section marked "read here first".

Also, when inspecting the main relay, be sure you use a good magnifying glass. The cracked solder points can be invisible to the naked eye. Or just do what many others have done... and just resolder every point.

[92exrkid]

Thanks for the help deevergote sorry I should have read first

[deevergote]

No problem. Nobody ever does.