Thread: SR20 in limp mode. Lost in the sauce

So to start off I was driving an noticed my battery light, so I took readings on the alternator and it's only making 11.5v. I was able to get home with no issues. 2 weeks go by and I don't drive it, just go outside and let it idle. I decided to rev it up one time and noticed it would only rev up to 2-2500rpm. At the same moment my tach dropped off and read 0rpm no matter what. I replace the alternator thinking maybe it had something to do with the tach and putting it into limp mode. Well it's replaced and the car is still in limp and i still don't have a tach reading. I've reset the ECU multiple times. The set up is a GTIR cluster, bluebird sr20, MAP ECU on an N/A ECU, MSD Digital SCI ignition control w/ blaster coil. Any ideas would be helpful, I've checked everything I can think of.


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Pull the codes? It usually tells you what's not working/connected that's putting you in limp. No RPM sounds like the distrbutor might have a hiccup?

A loose maf can also cause this.....check and reground it?

I'm on a MAP sensor. Not MAF

The codes I got when I pulled them, Heated O2 sensor, MAF (no maf), TPS, Ignition Signal, Knock sensor.

knock knock...

pull the ecu cover and check it out. sounds like something may of went bad inside of it.

I pulled it and didn't notice anything out of the ordinary. I'm on the hunt for someone here in Colorado Springs that has an extra laying around I can borrow and test that theory.


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Tried replacing the ECU with no change in symptoms. I've rewired the MAPECU harness. Replaced Cap/rotor double checked connections on everything major. Anyone else have any ideas?


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random ideas, but are you getting full volts to the system, any leaks around the map/intake, maybe if you wire a fuse for the map?

All of the systems are being supplied with proper voltage (MAPECU, ECU, etc.) The MAP sensor is directly into the manifold and I can't find any leaks around it. I've checked every dang fuse on this thing. Starting to think the MAPECU may have gone bye bye....