86 m20b27 to 87 m20b25-Issue with giving gas

[Derek_e30]

So I swapped my m20b27 to an m20b25 and now I have an issue with the car acting like it's going to die once the the throttle is pulled. I thought the issue was the MAF but I just replaced that and it didn't change much. I've also search all over the internet for other possible causes but haven't had much luck. Would the crank sensor be a possibility? I figure if the crank sensor is bad it wouldn't even start. Anyway, I'm loss and I'm in need of some help. Thanks for your time.

-Derek

[jlevie]

My first thoughts would be the fuel system. Tee a gauge into the rail supply line and check the pressure (should be a bit less than 3.0bar at idle and 3.0bar with the throttle open). If that is okay I'd have the injectors professionally cleaned, rebuilt, and flow tested (I like RC Engineering).

[Derek_e30]

Thank you for the reply jlevie, I will for sure test that tomorrow. Ive also ordered a crank sensor just for the hell of it. Maybe it was bumped during the swap.

[Derek_e30]

So I tested the fuel pressure today and at idle its at 2.06 bars and when I try and give it gas it moves slightly up to 2.6. So it looks like that might be the problem. Any ideas on what would cause that?

[jlevie]

A bad FPR or a problem with fuel delivery (clogged filter, bad high pump(s), or bad fuel line) could cause this.