JFoster

Ok so I have a turbo '95 LS teg and I have had it runing pretty decent on UD using my desktop. High 14s to low 15s AFR part throttle, 12s AFR WOT 10psi. Been runing good for prolly 6 months ... been shopping for a laptop to dial it in.

Anyway, I drove it to school a couple nights ago and set the cruise @ 65 on the way in town and it was fine with the usual 14-15AFR .... but as I got into town it started to take a ---- on me. Wanted to die at stop lights, on take off the AFRs were all over from 10-20 and back and it would buck and run like *** ...

Got it to school and popped the hood. Looked everything over and all seemed normal other than a couple tiny tears in my vac line going to my FPR right where it slips on. So I pulled it off, cut the end off and put it back and went to class.

Got out 6hrs later and it started and ran fine about half way accross town and then it started it again. Pulled over and checked all my other vac lines, all looked good. Figured I could limp it home. Got out on the hwy and set the cruise @ 65 and it ran a pretty steady 12AFR .... slowly climbed to 13 .... then 14...15....16, 17, 18 ... got off hwy.

Died at exit stop light. Started back up and bucked like *** taking off. Cruising ~50mph it would go from 15AFR to 19 after only a couple seconds of steady throttle. Ended up gaging the throttle the rest of the way to keep the AFR in the 14s....

At one point I floored it for a second just to see if it would make boost and it did, but went lean fast.

Need some comments on this. Stressed cause I am selling my DD right now and the LST needs to be my transportation for awhile. Kinda lost on the problem ... does this sound like a vac leak problem to you Any ideas ??

Thanks

JFoster

Hmmm... I put a new walbro 255 intank in it. I have a liquid filled fuel pressure guage on the filter and it reads normal ~40 at idle ... but the car surges and wants to die ....

JFoster

Well I guess it doesn't surge ... it just drops off and dies or almost dies ...

Thoughts? anybody else think its the fuel filter?

Got another person saying its the distributer ... anybody agree?

Any tips on how to trouble shoot this?

JDMFantasy2K

injector taking a ---- possibly?

i'd guess 02 sensor, but when those ---- and you hit full throttle it'll go into open loop mode and run normal... so i'd guess something fuel related.

idiot-stick

all things seem to point toward injectors then

Slo_crx1

Have you ever replaced the fuel filter up on the firewall? Could be gettin clogged up

JFoster

RC550s .... are you saying like a dead injector? wouldn't it be lean all the time?

No. Is there anyway for my to know that is the problem before I go buying parts?

Thanks

JFoster

Yeah, already done the thermostat a couple weeks ago .... lol . This car is gonna nickel and dime me to death

But my '01 GSR DD is leaving today so the LSt has to run by tuesday so I can go to school