2G Will not go higher than 2000 RPM

[GST0880]

I have an issue that has me stumped.

I have rebuilt trans and head. Car ran great the other day, I went to take it out yesterday and the car will not get above 2000 rpm. The only thing I noticed when driving was it wouldn't start after I drove it around until it cooled down for a hour.

I know the timing is correct because I messed up the first time and had to have the head rebuilt.

 

[luv2rallye]

Air intake hoses clamps tight?

 

[99gst_racer]

There's probably a check engine light, right? See if you can have the code(s) read.

Could be a faulty or unplugged mass air sensor... We could guess all day long though. Definitely get that CEL code scanned.

 

[GST0880]

Air intake hoses clamps tight?

Air intake hoses tight. When to take a ride and I just got CEL p0443 and now car seems to be missing could this be my issue.

 

[Clipsoe]

With what you're describing it doing I did experience once quite some time ago. I have had a blown ECU ground strap, and and bad ECU, but you can at least rule this out. I would look inside the ECU and double check as it will not cost you anything but some time to pull it and open it. Check the capacitors and make sure none are leaking as well.

This is where you're going to look.

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This is what it looks like burned.

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blownsensorground [ECMTuning - wiki]

www.dsmlink.com

https://www.dsmtuners.com/threads/blown-ecu-ground.409956/

Again, I experienced the symptoms you described, but don't remember the exact resolution, but this came to mind.

 

[GST0880]

The CEL of P0443, could this be causing the issue I'm having?

Only asking this is my first DSM that I have gone into depth with.

 

[luv2rallye]

The only thing I noticed when driving was it wouldn't start after I drove it around until it cooled down for a hour.

P0443 is an emission code and so unlikely to be your problem.
However check if you have the fuel pressure solenoid hot start problem: https://www.dsmtuners.com/threads/vapor-lock-hot-start.217349/#post-1821514

 

[waltah]

'Won't go above 2000 RPM' and 'won't restart until it cools for an hour' occurring together sounds like an ignition failure. Have you checked the plug gaps lately? If gaps are too wide for your turbo car there's much more stress on the ignition and you could be having breakdown in either transistors or coils.

'Pre-gapped' plugs may not be correctly gapped for your car. Never trust that.

Check the plug gaps and if excessive, reset them. Should be 0.028 I think? <- From memory so check the book. If this makes the problem better then yes, one or more ignition parts is/are failing.

Vaporlock does not occur while at speed. When it happens after a stop the car can be very hard to start -- 10-30 seconds of cranking -- but it will start, usually roughly at first and then okay.

(Older cars -- those with real carburetors and a fuel pump on the engine -- could vaporlock so badly they wouldn't start period -- until you cooled things down. Wet rags on the fuel line, let it sit for an hour, stuff like that. They had much lower fuel pressures. pump was hot too, and no fuel recirculation to the tank as ours have. )

DSM's are fine cars. You're gonna have fun with it.

 

[luv2rallye]

Another rare possibility is a temperature sensitive PTU. You can easily check this when running good however by just heating it with a hair dryer.

 

[GST0880]

Update: I found the issue with the bogging.

I found a loose hose from the throttle body.
I also found I had a bad coil primary.

 

[waltah]

Update: I found the issue with the bogging.

I found a loose hose from the throttle body.
I also found I had a bad coil primary.

The bad coil primary was the root problem. But still check your plug gaps if you haven't done so. The coil may have failed because of too-high voltages caused by too-wide gaps and if that's so it can happen again.