I turned my car on today 88 N/A and it idled fine let it warm up a bit went to go drive it and it was like driving a slug it has no power and i can get it past 4k rpm.

I was have a bog problem at 3800 for the past few months but it was drivable but now i cant even drive it. I recently changed the fuel pump but still has the same issue. I was thinkin it was the secondaries dumping fuel because takes a 1/2 tank of gas to go a few miles. Anyone else had this issue?

Stock 88 NA

 

If you have the original exhaust on her, you've got a clogged pre-cat or secondary cat. My guess. 4K was my "magic" point also, and she ate the hell out of gas...

 

could it be the secondaries? its been having this issue for a while and it does pass smog

 

Speaking of clogged cats, I'm going to gut my cats this weekend before I put them back on. I know if you gut them completely you can have problems with the 5/6th ports opening (S4). What if I just partially gutted them, enough to allow airflow, but keep backpressure. Would this work or am I insane?

 

i got the same problem and no cats. hmmm

 

hmm if secondaries were stuck open it wouldnt go past 4k right

 

Hermit- after I gutted my first two cats (long, long time ago) I THINK my ports were still working, can't really remember now. I DO remember feeling so much extra power with the first two cats out of there that I was wondering why I didn't gut 'em a lot sooner, lol...Which means the ports must have been working, huh?

 

just to the air pump mod real easy and you can kinda control port opening times

 

check your compression
thats how my N/A sounded when I blew my motor
check the TPS and the MAP sensor

 

I'll probably just do a partial gutting until I get the money and such for the rpm switch activation. Hell, gotta get the car off of the ramps it's been on for 2 months.

 

Yes, by all means get her running again- more stuff will break just sitting there, lol...

All you really need to do is reroute your "vac" hose from the split air pipe to the air pump hose (between the air pump & ACV) and tap in there. Install a little "T" in the line so that you have a means of dumping excess air & regulating the activation pressure (by adjusting the size of the hole in the end of the "T"), and your set. I've been running with this setup for quite a while now with no probs...

 

WTF is a MAP sensor? AFM maybe?

Just for ***** and giggles, check your coolant thermo sensor (under the alternator, green plug)

I've heard that S4s... if that sensor is bad/unplugged, it'll give the car a "limp mode" kind of feel. (S5s have a 'limp mode' if the MOP is bad)

 

Sounds like you need your throttle posistion sensor fixed, my friend has this problem oh his hachi, he also has some loose lines like his cruise control that isn't used and is just hanging, he needs that bypassed.

-Andrew

His car won't rev past 5k

 

Mine is almost like the secondarys arent working at all very odd. Could it be the CPU?

 

Here's a fairly simple way to check for clogged cats- rev it in neutral, does everything seem normal? Now go have some fun, does everything seem normal until you hit about 3.5 to 4K? Are you using more gas than you were before the problem? Classic symptoms, man...

If you think it's your secondaries, just disconnect the connectors from the injectors, and take her for a spin. Anything change?

If she starts well and revs well in neutral, don't worry about blown motors just yet...

 

In neutral it bogs really bad, I tried new injectors same problem, the exhaust seems to be flowing out the back but the garage fills with fumes after I shut it off, I will probably be trying the CPU later, The engine has 174k miles on it there is no smoke or sign of failure other than the bogging under 3k.

Reving it in neutral if i floor the pedal it rev's to 3500 then tracks down to 3000 and sits with the bogging sound. If i dont punch it It goes to 4000 and stays. The temo sensor is plugged in, tps is new, checked timing dead on, AFM is ok tried 2 car has new fuel pump only thing i havent tried is filter.

 

OK, well, why didn't you say all that in the first place, lol...So clogged cat is out, for now...Have you pulled any codes yet? Something's gotta be coming up with it running like that, I would think.

Clogged fuel filter will also rev fine in neutral, but bog under load, so don't think it's that, either. Do you know how to get to your ECU? You can pretty well troubleshoot the entire performance related systems from there using the FSM, fuel section...

How are your grounds?

 

i just switched the ecu same deal, could it be the cat? grounds are ok havent really cheaked all of them need to check engine codes.

 

Man, if it's the cat, it's clogged BIG time, but usually with a clogged cat light loads (like revving in neutral) aren't affected as much. I'm not talking about replacing the ECU, I'm talking about testing all the relevent sensor inputs AT the ECU. Yes, you need to check codes also. And when you get to the ECU to check those inputs, check your 4 grounds at the pins too, especially the two on the small plug (#3) with all the injector wires. These two run to the rear rotor housing ground, which seems to give a lot of guys fits...

 

Grounds seem to be ok hmm would this mean blown engine usually? im gonna try takin the exhaust off see if it helps

 

Please tell me youve tried changing your spark plugs and leads!

Please tell me youve checked your fuel filter!

Please tell me youve checked your coil packs!



Its always little things that you overlook, these may not be the problem but could definately cause the problems you are having!

andy

 

plugs are new wires are new, got a filter havent changed it yet, Coil packs are ok

 

Well, if it's just as bad in neutral as all other loads, it MIGHT be the engine, but you're going to need to rule out everything else first...Just go over her system by system, fuel, ignition, etc...Have you done a compression check yet?

 

Yea do the compression check first so you arent running around looking for nonexistant problems.

 

If you've still got the charcoal can, check the vacumn line that goes to the engine.
Mine came off where it ends up under the BAC. Had most of the same symptoms you describe. They all disappeared after I stuck a new hose on it.
Good Luck, it'd be a real cheap fix.
Gerard