Rx7Nub

Hey, my TII seems to misfire or something, when I get at high revs, like 5500+ in 2nd, and then it normally get's worse in 3rd, 4th, and 5th. It really cuts back on acceleration, and you can feel the whole car jut back, it's like i kept letting go, then slamming on the gas pedal, but makes a huge bang. I changed the spark plugs on the weekend and nothing changed, could it be the coils? Or do you guys know of any other problems with these symptoms?

Also, say I go drive it around for about 10 minutes, then i shut it off, and go to start it back up in anywhere from 5-30 minutes, it has a real ahrd time starting up. I have a fuel cut switch, which I use to turn the car off, and when I try to restart the car like I said above, I turn the key, with the switch on, then it hesitates, so i flick the switch off, still holding the key, then it starts up, and I flick the switch on quick. This is starting it from neutral, and yes, I have tried starting it with the switch off, but I get no luck, same type things happen.

Could these two problems be related, I am thinking it's maybe the coils? Or does anyone else know, I talked to a friend with an FD, and he says he had the same problem, he said it shouldn't be the injectors or the fuel, and another friend with an FD, when he was driving behind me, said when ever the car "misfires" or kicks out, he see's little blue flames, so I don't think it would be fuel, coz blue flames = running rich? i think, thanks for all the help.

-Mark

Turbonut

iTrader: (1)

Just out of curiosity,can you "feather" the gas pedal to let's say 5500 and no problem? How about if your steady in 3rd @ 4500 and floor it. Will it kick back? Just trying to see if it's under pressure when this happens, or it's just rpm related. Had a similar problem in '89TII. Would kick back under heavy acceleration, but I could go 80/90 as long as I babied the throttle. Checked fuel pressure, wires, spark, filter, etc. Turned out to be a sticking/cracked seal. It didn't show up on a compression test.

Turbonut

iTrader: (1)

Just out of curiosity,can you "feather" the gas pedal to let's say 5500 and no problem? How about if your steady in 3rd @ 4500 and floor it. Will it kick back? Just trying to see if it's under pressure when this happens, or it's just rpm related. Had a similar problem in '89TII. Would kick back under heavy acceleration, but I could go 80/90 as long as I babied the throttle. Checked fuel pressure, wires, spark, filter, ecu, injectors,etc. Turned out to be a sticking/cracked seal. It didn't show up on a compression test.

Rx7Nub

Yes, I can feather the gas pedal, and get up to higher speeds, It is when I pound on the gas this happens.
Ouch, this sounds expenesive. Is it?

Rx7Nub

bump

2a+RoN

Thats the exact same problem I'm having in my car! I'm gonna put some 750's in soon and i hope it will help. I really wanna know what this is too!

2a+RoN

If it is seal failure, then yes it is expensive and i hope its not, otherwise i'm f'd!

2a+RoN

Turbonut: I tried that before and it will go all the way to redline if i go easy on the throttle, but at wot, it jumps all over the place. Think i need a rebuild???

Rx7Nub

My engine was just rebuilt last year

2a+RoN

mine has 136k miles on it. never been rebuilt and i hope doesn't need one now cuz i don't have the extra $$$

Rx7Nub

this better not be seal failure, i dont want to deal with this... that is if it IS expensive..

2a+RoN

wouldn't it need a rebuild if the seals are failing? any other way of dealing with the problem?

sub-zero

Mark, try a search on hesitation or misfire. Try the 3rd gen section if nothing shows up here.

sub-zero

Mark, try a search on hesitation or misfire. Try the 3rd gen section if nothing shows up here.

Rx7Nub

geez, good thinking, hah! i totally forgot about search.. lol

Scott 89t2

fuel cut???

Rx7Nub

I am fairly sure it's not fuel cut, my friend said he say little blue flames coming out of the muffler's in between the "misfires" so I would be running rich?

-Mark

Rx7Nub

bump?

Gen2

iTrader: (3)

have you checked your timing?? line it up with the marks on the e-shaft pully and take off the cover of the CAS to make sure they're aligned...

yearrgh

Does the bang have a metal pinging associated with it?

2a+RoN

mine has no pinging. haven't checked the timing yet though. its not really a bang, more just a jerkiness throughout higher rpms. if it were a seal failure, then wouldn't it happen regardless of gears. mine doesn't do it at all in first though, i cun run all the way to redline with no problem, but once in second it just jerks anywhere over about 4.5k.

Turbonut

iTrader: (1)

Just thought I'd jump in again. When mine went, it didn't kick back in first or second. On the street it only did it in third or forth. When Dave @ KD had it on the dyno, it would do it in first, on account of the load on rollers. It wouldn't show on a compression test though. After the engine was replaced, I never had it taken apart to see if it was a sticking or cracked seal. When I had this problem a fellow from Michigan had replied that he had also seen this situation caused by a cracked seal.

SaabGuy

What do you have for intake/TID??

When I got my car I had to replace the lower part of my TID. I used rubber PCV elbow from Home Depot. Wouldnt you know it was colapsing completely at 5500rpms do to the crazy amount of vacumm before the turbo.

2a+RoN

well i have just a cone filter on there, but it seemed like all of this started right after i put it on there. maybe the tid was brittle then when i replaced the stock airbox, putting the new filter on could have cracked part of it?? i dunno. i just hope i don't have to rebuild.