My 88 N/A is having issues, it starts and idles fine but at WOT it won't rev past 4500 rpm. i've checked compression, got 110-110-110 psi on the front rotor and 100-100-100 psi on the back rotor. I've got good spark on all 4 plugs and they don't look like the car has flooded any.

i'm going to change out my fuel filter, but does anybody have any other ideas of what might be causing this?

 

If not a fuel problem, it is quite possible that your exhaust is clogged. Do you still haev your cats?

 

hrmm i do have a stock exhaust system. i didn't even think about that. the car has 214k miles on it. so that would make sense for the cat being clogged

 

def. clogged cats. dont drive it until you clear that up. its very bad for your engine. pull the cat and gut it.

 

hrmm, i think thats a project for next weekend. thanks for the response guys

 

MAF is going bad replace it and then check your cats if problem persist. This also happened to mine and my chicks N/A FC's

 

please log off the forum

 

^ lol

 

I have no cats and mine does the same thing, I thought it was the cats also. Its an 88 N/a also.

 

could be a bad O2 sensor man

 

I doubt it. There are people that run fine without o2 sensors at all. Does it start running bad at about 3800 and barely make it to 4500, or does it just suddenly hit a wall at 4500?

 

it revs slower than normal all the way to 4500 then just hits a wall

 

Part of mine was Ignition related. Now when you get into the higher rpms over(5500) under load, let off and try to get back into the throttle it does not want to accelerate. If it does it does very slowly.

 

l

 

Good stuff

 

def not o2, i havent run hooked up my o2 to the computer in like 2 months.

 

Ok i've replaced my fuel filter, converted my aux ports to s5 style and replaced my cat with a straight pipe. No change in behavior. any other ideas?

 

why is it not the MAF karak?? it fixed the problem with both my cars. both of them would rev right up to about 4K and then just hit a wall; we replaced the MAF and it fixed it on both cars.

 

i would check the injector plugs on your seconderies

 

electrical plugs or the pintle caps?

 

electircal plugs.

 

ok i'll check those tonight.

 

ok my secondary injectors are within spec 12.6 ohm on the rear 13.0 on the front. i had continuity from the connector to ground. when the car was idling i had around .100 VAC and at 3500 rpm i had around .450 VAC. both of the connectors looked intact, if a bit dirty so i cleaned them with some isopropyl alcohol and let them dry. the behavior still remains the same. i guess now is the time to check the MAF.

 

Ok i've check my MAF and it's WAY out of spec. E2 to Vs is an open circuit
E2 to Vref is over 1.2kOhm, so i hope that's the problem. i've found one locally in a junkyard so i'm gonna go grab it tommorow to find out.

 

I expect an appology. now please log off the forum.