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View Full Version : SR20DET bogging problemo.


shanelach
05-04-2010, 04:36 PM
OK so about a month or so ago, I did a small pull through second and some of third. The pull was on 9 lbs, stock SR, nothing major. Don't usually drive on 9 lbs though, just stock 7. After doing so, my engine started bogging under acceleration. I thought, "Oh, coupler popped, no big deal." I was wrong. I started going through everything and couldn't find anything wrong. I went over my maf wiring and shit and couldn't find anything wrong. After a couple of days the problem went away completely.

As of late last week the problem returned. It stumbles bad and wants to die under acceleration after the engine is warm and has been driving for 20 minutes or so. It isn't every time I put a load on it though. Maybe every 3 or 4 throttle hits. It also bogs once and a while around 2K RPM's cruising. When it starts bogging, bucking, back firing lightly, and wanting to die, if I stay on it it will smooth out around 3K and run all the way to red line.

I have changed out my coilpacks, all of the poppets in the injectors seem to be opening, because i placed a screw driver on the injectors and put my ear against it. Steady clicking on every one and speed up with revs at a stop. I checked my CAS timing and it is spot on as well. Dots line up and I am 15 degrees BTDC. Fuel pressure is at 37 PSI with the vac line hooked up. Coil pack harness seems to be good to go, and the ground is bolted up. I checked the TPS and it was good, and threw a coolant temp sensor at it as well. That didn't change anything. I am not throwing any codes either.

The car does not smoke or anything. No oil in pipes, nothing in the IC, vacuum is at 23"HG, and the engine hits boost fine.

Not sure if I missed anything I covered. I'll edit if I remember anything. Thanks for the assistance.

gigity
05-04-2010, 08:59 PM
OK so about a month or so ago, I did a small pull through second and some of third. The pull was on 9 lbs, stock SR, nothing major. Don't usually drive on 9 lbs though, just stock 7. After doing so, my engine started bogging under acceleration. I thought, "Oh, coupler popped, no big deal." I was wrong. I started going through everything and couldn't find anything wrong. I went over my maf wiring and shit and couldn't find anything wrong. After a couple of days the problem went away completely.

As of late last week the problem returned. It stumbles bad and wants to die under acceleration after the engine is warm and has been driving for 20 minutes or so. It isn't every time I put a load on it though. Maybe every 3 or 4 throttle hits. It also bogs once and a while around 2K RPM's cruising. When it starts bogging, bucking, back firing lightly, and wanting to die, if I stay on it it will smooth out around 3K and run all the way to red line.

I have changed out my coilpacks, all of the poppets in the injectors seem to be opening, because i placed a screw driver on the injectors and put my ear against it. Steady clicking on every one and speed up with revs at a stop. I checked my CAS timing and it is spot on as well. Dots line up and I am 15 degrees BTDC. Fuel pressure is at 37 PSI with the vac line hooked up. Coil pack harness seems to be good to go, and the ground is bolted up. I checked the TPS and it was good, and threw a coolant temp sensor at it as well. That didn't change anything. I am not throwing any codes either.

The car does not smoke or anything. No oil in pipes, nothing in the IC, vacuum is at 23"HG, and the engine hits boost fine.

Not sure if I missed anything I covered. I'll edit if I remember anything. Thanks for the assistance.



Im having a problem close to yours does it only happen when motor is warm? Mine runs fine cold but starts to run like shit when warm.

shanelach
05-05-2010, 07:21 PM
It only happens after I have been driving it a bit. I get like 2 miles and it starts shitting out. Checked out the fuel pump and it seems to be good. It's a Walbro that was put in not TOO long ago.

GARzNSANE
06-12-2012, 07:34 PM
re-cycling old thread because there was never an answer. my drift car is experiencing this same issue. Any clues?

Dynasty sLiDeWaYz
06-15-2012, 09:14 PM
im having the same exact issue as well...someone please help us diagnose this!

KiLLeR2001
06-15-2012, 09:24 PM
Check spark plug gap. Stock gap is 0.036".

Check resistance on all of the injectors. 11 ohms is normal.

Replace fuel filter if its been awhile.

Dynasty sLiDeWaYz
06-15-2012, 09:49 PM
Set the gap when I put new bkre7's in to .040 while running 14pounds..upgraded to z32 air filter a month or so ago...

guess I will check the resistance, thanks for the info killer

KiLLeR2001
06-15-2012, 09:52 PM
More boost you run the lower the gap needs to be, try gapping down to 0.030" and see how it runs.

intel5811
07-01-2012, 12:53 AM
Yeah I know it's been awhile but it for sure sounds like a spark plug problem...

razvandumitrescu
09-23-2012, 05:44 PM
check oxygen sensor wires