SR Problem (Searched)

[Souless]

Hello, I don't post here that much because I basically just come in and properly use the search button. Unfortunately I searched a lot and could not find a similar problem to this.Here are the details:90 CoupeRedtop SRStock Boost, Stock Turbo, Stock ECU.Motor has good compression.

Problems starts when it hits boost. The engine will rev to w/e RPM as long as it's at vacuum, once it hits boost (around 5psi), it just hits a wall. It falls flat on its ***. At first glance we thought it was a boost leak, the vehicle originally had an EBAY bov, I changed that to a Greddy TypeR. Originally it had some sloppy *** turbo inlet pipe which sat the MAF too close to the turbo, changed that. I had the harness redone completely thinking it was some screwed wiring by the previous owner.

Injectors work, Coils work, Timing should be good. But if timing was the culprit of this problem, the car would basically break up at a certain RPM and then rev up till redline, basically when it hits this "wall", it just stops. Only option is to let off.

Only other option is the ECU or maybe the CAS. I'm wondering if anyone has experienced a problem like this before. Motor turns on fine, idles perfect, doesn't overheat....nothing. Just this one problem.

[Fonz]

i feel ya , im having the same problem and have yet to solve it. i hear checking the gap on the spark plugs worked for other ppl but it hasnt for me though. This is a symptom of many things that could be wrong =/ aka pain in the ***. check here though. zer...age=1 im goin down the list of things ppl have tried. gl man and if you get it let me know

[Souless]

^any updates?

[Fonz]

not yet =/ gonna change my fpr and clean my maf today. ill update when i find something

[Sil80315]

have you checked your timing? if you are just running the factory timing and not timing it to 15 degrees then it will feel like it had no power when it hit boost.

you would hear the turbo spool but the car wont feel any more powerful. ALSO if your trying to time it with a timing gun and you notice its jumping all over then you have a bad TPS sensor.

with a bad TPS sensor the ecu will start throwing timing to correct it.

If you think its spark plugs then then make sure your running atleast a NGK BKR7E's its a colder and gap them from 0.28 - 0.30.

keep us posted

[Souless]

Just tryed another ecu. Same ****.

Installing a new fuel pump tomorrow, if not that then checking timing.

*sigh*

[Souless]

Fuel Pump changed. Problem solved.

[japslapsilvia]

Fuel Pump changed. Problem solved.

was your sock filter really dirty?? if it was, then chances are you have a lot of sediment in your tank. i would suggest drainign the tank and cleanin out all the sediment.

[aznrib]

what fuel pump did you have before

[Fonz]

gratz dude, im gonna try that next.

[Souless]

It had a walbro before which was extremely loud, now you're not supposed to run walbros below 1/4 tank of gas. Mainly because it's a high volume fuel pump and it'll suck any 18 year old dirt that's at the bottom of your fuel tank.

That's what the other guy must have done, either way I'm gonna drain my tank and re-install it the first change I get.

[mycleans13]

hey im am recently having the same exact problem as you were down to the t and i have kinda noticed that my fuel pump has gotten louder i just always thought they either work or not but ive checked ever thing else except the cas and pump ive seen so many threads with the same prob but noone ever finishes them im gonna swap out with my buddys pump hopefully thats my prob too its one of the cheaper fixes

[Fonz]

Got it fixed a while ago, Turned out to be the fuel pump. try that and gl

[mycleans13]

sweet so u and souless had the same problem and it was the pump for both of u i do remember running the car real low now that i think back so thats gotta be it ill keep u updated

[mycleans13]

so it wasnt the fuel pump i checked my injectors w/ a meter 3 were at 11.5 ohms (cold) and the 4th was at 23 (cold) got a fuel rail with 4 good injectors and still does it do i need to reset my ecu or something this s**t is frustrating i dont have an fsm but dont u just unplug the "negative" terminal for maybe a half hr?