1G Car loses power after 30-45 Minutes of Driving

[Jtp0013]

I have a 1ga and I've been messing with the car for a while just recently built the motor and it was running great for the first few weeks but now when I go for a drive it'll run pretty good for about 30-45min and then drops to idle but if I turn the car off and then back on I get throttle response but only for a few minutes before it loses throttle response so my question is what could cause this or has anyone ever experienced this?

 

[Mello]

Does this go away if you turn your car off & let it cool down? Does this come back after cooling in another 30-45 minutes of driving?

 

[curt-s]

Maybe check transistor and coil pack connectors for broken contacts that are still in there but not making proper contact especially when warm

 

[greddy_1700]

Overheating fuel pump? Just guessing at this point, not much to go off of unfortunately. You will need to start doing some testing and reporting back with findings.

Are there any other symptoms? do your gauges fluctuate wildly? any electrical "clicking" noises from relays, engine temp, coolant temp, etc.

 

[Jtp0013]

Does this go away if you turn your car off & let it cool down? Does this come back after cooling in another 30-45 minutes of driving?

So after the 45 it drops to idle I’m able to turn the car off and back on and I’m able to drive for another 5 min or so before it begins to lose throttle response

 

[Jtp0013]

Overheating fuel pump? Just guessing at this point, not much to go off of unfortunately. You will need to start doing some testing and reporting back with findings.

Are there any other symptoms? do your gauges fluctuate wildly? any electrical "clicking" noises from relays, engine temp, coolant temp, etc.

Right before I lose throttle response it leans all the way out I’ve tested the fuel pump and it doesn’t seem to be bad or overheating

 

[dwb]

How are the caps in the ECU? Do you have a CEL code? Do you have access to a data logger where you can look at sensor values?

 

[Jtp0013]

How are the caps in the ECU? Do you have a CEL code? Do you have access to a data logger where you can look at sensor values?

Not sure on the caps they looked good when I got the ecu a year ago. I have no cel codes and for a data logger I run dsmlink