Bogging down, stalling and weak accel. Where do I go from here?

[S_Jerusalem]

I have a manual transmission 2001 NB with an AEG engine. As I mentioned it stalls, bogs down and is weak on the accel. Particularly from 1st to 2nd.

I have replaced the forward 02 sensor which was bad, the air intake filter, fuel filter, plugs and wires, coil pack. I have cleaned the MAF. It may be bad, but I don't think so. I'm not getting any significant improvement from having it unplugged.

I have a thread about it over at 2carpros HERE if you want to see everything I have tried in a little more detail.

If anyone here has any experience with this I would love some input. I really don't want to take it to a shop and get gouged.

Thanks everyone!

[Smileybug]

Any CEL?

[S_Jerusalem]

Yep. CEL is on. I am going to limp it to my auto parts store tomorrow and check the codes again and reset it to at least see if I have cleared up anything.

It had the forward 02 code, and multiple misfire codes beforehand. When I drove her around the block a few times today, I did not notice any misfiring as far as I could tell.

[S_Jerusalem]

I suppose that some of this could also be caused if my fuel pump were going. Is there any way to check that?

At this point I have basically replaced all the inexpensive bits or the ones that I knew were due anyway. I'd like to avoid blindly replacing things that are more than $30-45.

Also, any tutorials out there on opening up the dash so I can manually inspect the wiring to the ECM? I have read a few people with issues similar to mine had some short to ground issues that came from worn wires there.

[Smileybug]

I'd get the code(s) again before you go tearing into the car. There can be many reasons for things like this but codes will help point you in the right direction.

[S_Jerusalem]

Okay. I'm going to run through all the ones I mentioned and knew of before quickly.

P0300, 0301, 0302, 0304, 0303, all misfire codes.
P0134 forward 02 sensor

Now I had all of these...

P1225, P1226, P1227, P1228, Injector circuit cylinders 1-4 short to ground.

P1425 Tank vent short to ground

P1472 EVAP control system LDP short to ground

P1128 Long term fuel trim B1 system too lean with the following snapshot:

fuel sys 1 CL
fuel sys 2 NA
CALC LOAD 14.1%
ECT 168
STFT B1 25%
LTFT B1 25%
RPM 2914
Speed MPH 57


I cleared all the codes, and drove her home. CEL has not come back yet. She is still a bit hesitant and boggy, but I do think resetting the 02 helped some. I'm going to drive her out to a friends house and back tonight (about 40mi round trip) to see if the cel comes back, and to give me some operating time to check any possible codes tomorrow.

I would love any input on these codes and where to go from here. Thanks so much!

[VDubBeetleGuy]

This may sound dumb. But have you checked any fuses or your grounding wire?