this is the story bought 87 GXL..Ran great had the usual 3800rpm stumble , but didnt bother me.After 2 weeks of driving the car now bogs like hell going up to 3800rpm, tps is adjusted, plugs and wires are good, fuel filter changed as well, i dont know what else to do..is it possible for someone to put the fuel filter in upside down??thanx in advance for anyone that could help..

 

Are there any mods to the car?
What exhaust is on it? Do you have cats? Are they clogged? Have you pulled any codes? How is the timing? What about the AFM?
Does it bog at full throttle/light throttle/any throttle?
Did it do it all of a sudden, or was it a problem that got progressively worse?
Does it run well after 3800 RPM?

We need more info...........

 

Might be a bad TPS or airflow meter - a bad TPS can actually be set, but the resistance will jump all over the place, causing the ECU to think you're mashing the gas when you're not.

I'd start with the TPS.

Dale

 

ok to answer a couple of questions
car is stock w/ cats
used code checker and not pulling any codes
cats dont appear to be clogged
car bogs when im trying to accelerate under load, doesnt do it if the car is in nuetral and reved.
most importantly it started a little bit not really a problem but thought it did this cuz i was low on gas..when i filled the tank it still does this worse than before.
lastly it seems to run better after 3800rpm..
I checked the tps twice,maybe this will help it looks like the person before me made a connection to the injectors right from the TPS..the wires look like they are spliced in..fellaz dont get me wrong the car ran damn good than all of a sudden this happens...thanx agin fellaz for listening hope this info helps out..

 

If your injector wires are spliced theres a good chance thats your problem. My car did the same thing...the wto different injector wires were touching each other and shorting out. Seperated them and no more hesitation!

 

Did you change gas brand? Well, I don't know if this had happened to anyone but it happened to me during my travels to Sevenstock. I usually put 76 on my car (doesn't matter what rating) and at one point I put Mobil because there was no 76 around and I had to fill gas. After this, my car bogs like crazy at idle and any gear. I suspected right away that it was the gas so I tried to used up all the gas as much as I can. My mistake was, I had a full tank in there with Mobil. My car ran crappy until I filled it up again with 76 when it was almost close to empty. After that with just a few miles of driving, my car didn't bog anymore and has been running fine just like it was before.

 

hmm injector wires,boosted rotors you said yours were spliced too, why would some one splice the wires??as far as the gas theory i use mobil 1 i think 89 octane..now as we stand my tank is full..thanx guys i see what happens next.. i really dont wanna turn the 7 into a BBQ LOL!!

 

YAY!!!!!!i finally found my problem..it was a little silver clip which holds the injector wire into the injector was falling off..it was actually so loose that it came off completely when i removed the intake..i pushed that bitch in nice and tight and tied a wire around it just to be on the safe side..now she runs like a bat outta hell..thanx everyone who responded to my problem

 

YAY!!!!!!i finally found my problem..it was a little silver clip which holds the injector wire into the injector was falling off..it was actually so loose that it came off completely when i removed the intake..i pushed that bitch in nice and tight and tied a wire around it just to be on the safe side..now she runs like a bat outta hell..thanx everyone who responded to my problem

 

oops sorry for the double post!

 

sorry to bring up an old post but i bought this car from him and it still bogs and stumbles all over the place. what would you guys recomend i do to fix it? i ordered a new fuel filter and if that doesnt work im going to get my injectors cleaned and if that doesnt work im going to replace the fuel pump. does that sound good??? please help me i want to have the car running good by teh time i save up money for insurance.

 

the filter on the fuel pump could be cloged, also the spliced wires maybe crappy, or coroded. the intake temp sensor on my car was not plugged in one time and it did the same sortof thing, but my car is a turbo, also another thing that happened after a pulsation dampener swap, the p-d i put in had gotten frozen in sort of a "closed" position not allowing fuel to flow thru.

-Chris

 

what could i do about the spliced wires? are they replaceable? is it alot of work? and does anyone have an online repair manual for FC's?

 

yea, it would be alot of work, check the wires first, they may just need to be re saudered or something, also you can see if they get voltage, im not sure how much, just make sure both are close to the same

 

there ya go. i know you would figure it out. cause i didnt know.lol

 

bump

 

fuel pump ? just a guess

 

if the fuel filter was clogged it would affect top end, not bottom. check the wiring on your fuel pump and your spark plug wires. change the plugs if you haven't recently.

 

plugs are brand new. im new to rx7's so could you tell me where the wires for the fuel pump are? and what i should look for with them?