Possible fuel problem

[glt-4-6]

I had my engine completely rebuilt with forged internals and bored .10 over and dropped it back in the car. After double checking all connections I started it to go for a drive. When I first left it was revving fine and boosting like it should but the longer I drive it the lower it revs. At one point it was cutting out at 2000rpm but still building boost.

I know I have some vacuum hoses missing (the previous owner didn't take care of it) but I don't think the vacuum leaks would be causing this. The only other thing I can think of is bad gas. It had 1/8 tank of gas from about 8 months ago.

Any help would be great. Thanks

 

[boostonboard]

Do you know what your fuel pressure is?

 

[jrohner]

I had my engine completely rebuilt with forged internals and bored .10 over and dropped it back in the car. After double checking all connections I started it to go for a drive. When I first left it was revving fine and boosting like it should but the longer I drive it the lower it revs. At one point it was cutting out at 2000rpm but still building boost.

I know I have some vacuum hoses missing (the previous owner didn't take care of it) but I don't think the vacuum leaks would be causing this. The only other thing I can think of is bad gas. It had 1/8 tank of gas from about 8 months ago.

Any help would be great. Thanks

You need to get any possible leaks fixed. DSM's don't need hardly any vacuum lines, so plug them. Leaks screw with your tune, since the ECU sees the wrong amount of airflow -- making your fueling and ignition timing wrong.

 

[JEFFREYCASTGSX]

Gas from 8 months ago? More than likely its bad gas, check for boost leaks. Vaccuum leaks on MAF cars(especially ones with turbos) can cause uncertain readings.

 

[glt-4-6]

I just drained the old gas and plugged a few of the vacuum lines which helped a little. I checked over everything again and found a tear in the rubber coupler between the turbo and intercooler pipe. After fixing that it runs perfect. Thanks for the help.

 

[jrohner]

I just drained the old gas and plugged a few of the vacuum lines which helped a little. I checked over everything again and found a tear in the rubber coupler between the turbo and intercooler pipe. After fixing that it runs perfect. Thanks for the help.

It's good to hear that you got it taken care of.