Car won't rev past 4k rpms

[DiamondStar90]

Ok guys here is my full story on the car... the motor in the car is a 98/99 engine and has just been recently rebuilt with 50 miles on it ...everything is stock on the motor except it has a 20g running 8-10psi,front mount intercooler with a tial 50mm bov,255 walbro.

So for some reason when i drive or neutral the car it seems like its lacking power and wont rev past 4-4.5 rpms ...i did a compression check at it came out 170-180 psi across all 4 cylinders ...i just cant seem to figure out what is wrong with the car
does anybody have any oppinions or suggestions i can try and if you guys need more info please let me know

thanks

 

[minimoose]

Did you replace the TPS when you were working on the car.

 

[DiamondStar90]

Did you replace the TPS when you were working on the car.

It was off at one point during the rebuild and not sure if its set or how to set it and you are referring the the black sensor right in front of the pvc nipple right?

 

[Ev0Stev0]

sounds sort of like a problem I had with one of my first 1gs; I would check your ecu. Pull it out and see if there is any noticeable corrosion and check the caps.

 

[DiamondStar90]

sounds sort of like a problem I had with one of my first 1gs; I would check your ecu. Pull it out and see if there is any noticeable corrosion and check the caps.

what do you mean by checking the caps and if you can please post a picture and by the way didn't they only have that problem on the 1g's ? this is still the 97 stock ecu

 

[Ev0Stev0]

what do you mean by checking the caps and if you can please post a picture and by the way didn't they only have that problem on the 1g's ? this is still the 97 stock ecu

ecurepairhome [ECMTuning - wiki]

Check out that page.

I have no personal pics. and yes the earlier ECUs in the 1gs had issues, but those issues continued into the later ECUs to my knowledge, although maybe not as much.

my 1g would 'bog' out bad and when i would nail the gas it would only rev to about where you are saying, and it would do it very slowly.

 

[stuckwithgsx]

Spark plug gaps good? What kind of plugs? Wires? Coil resistance? Ignition Control Module (next to coils) could not be connected completely?

Sounds like fuel or spark to me. And those are easiest to diagnose IMO.

 

[miguelmcv]

Check your TPS first.
Is more like an Off Throttle Position Sensor.

Adjust your throttle position sensor.

Here is a thread that tells how to adjust it, Hope this helps.

http://www.dsmtuners.com/forums/newbie-forum/324431-how-adjust-throttle-position-sensor-tps.html

 

[krishansheanh]

what injectors are you running? is it a cut off?

 

[6A12TT-7G]

What type of ignition system does it have? distributor or coilpack? I was having a similar issue with my 7g galant, the wasted spark system it uses has a spark controller that runs the coilpacks, which from factory is faulty... mitsubishi even admitted to it and didn't recall them!!

The controller has 2 or 3 banks for 4 and 6 cylinders respectively. Mine was dropping cylinders at random sometimes getting down to 2 or 3 cylinders and wouldn't rev past 3-4k rpm. I was lucky to limp home a few times on 3-4 cylinders...

The module is usually mounted below or behind the coilpack mount.

When this module gets buggy it can nuke your coilpacks as well by not switching them off to charge properly before the next spark.

Good luck with your efforts

 

[Ev0Stev0]

Have you tried any of these suggestions yet? I think we have given you a really good basis to rule out the problem. make sure to give feedback and let us know if you found a remedy and what it was!