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very annoying miss

Nick Wise

Nick Wise

Well-Known Member
I'm starting to run out of ideas on my car. Thought we had it fixed this weekend. but I was wrong. First I'll start by saying what is wrong.
Sometimes, just driving down the road, I will get a miss. Could be just once and done, sometimes its a series of misses like i'm running on half the cylinders or less. Of course there are some days when this things runs awesome. It has done this since I bought the car last year. Seems like the more I drive it and shut it off, then start it back up again, it gets worse. It has gotten to the point where it would flood itself out and shut off sometimes (rare occasion, but it does happen). But there is no rhyme or reason as to when or why it does this. The only thing I've noticed lately is that if you jump on it when it starts to miss, it will run just fine.
Next, things I've tried. Set the cam sensor(off slightly). Set the TPS(also off slightly). Tried different coil pack and module, and also MAF sensor both from a friends GN. Replace O2 sensor, checked ground from battery to block. Checked the fuel pressure( little high, about 6- 8 psi. need to get an adjustable regulator). The car has just under 46,000 miles. New Plugs, wires, Map sensor, O2 sensor, Turbo Tweak stock chip. No vaccum leaks, I do have a small crack in my right exhaust header. Also have a Scan master hooked up and running an older Snap-on scanner. Nothing showing up anywhere to cause what is going on, and there have never been any codes. Any info would be greatly appreciated. I'm starting to run out of Ideas. :wall:
 
Fuel pump or that regulator, maybe injectors, injector harness, your running out of things to replace though

next thing id try is that regulator
 
I'm replacing the regulator next. I was thinking injectors but I'm not sure if that would cause a random problem like that.
 
You should be able to test the regulator by putting a vacuum gage/pump on it and it should hold vacuum halfway decently (slowly bleed down over a couple of seconds). Do you get knock when you get into more than like 5psi boost? Normally when the regulator goes bad it the diaphragm rips and it won't hold pressure under boost and you'll get knock.

Your header leak should be fine as long as it's small. You might also want to try the coilpack if you can find someone near by with a GN or TTA that has one you can borrow to test with.
 
Already tried coil pack from a friends GN. Regulator holds pressure, it is just higher than it should be. By about 6-8psi at idle.
 
SES light never came on or flickered. Never had any codes. I check it almost every time I drive the car.
 
The previous owner had replaced the gas tank with an E-bay special. Said it was because of it sitting so long( since 1996) wanted to get the car running but there was a lot of crap in the tank from sitting so they replaced it. when I got the car I noticed instead of replacing the fuel filter they made a piece of pipe to replace the filter. I don't know how long this was there or if it was there before they replaced the tank. If something got through could that cause an intermittent problem like this. If so what should i check. I also believe they replaced the starter.
 
Next thing onthe list is to replacethe injectors. Talked to Jim Dunn while I was at Kirban's on Saturday and he agrees that is very possible where my problem is comming from. So I guess I will put an order in for 60# injectors and while I am at it I'll get a fuel pump and hotwire kit as well. was trying to put the fuel pump off since I had just done one im my Camaro last year, and I know how much fun they are. I guess they are not that bad when done on a lift with a couple other people around. But it does need to be done. Sounds a little funny sometimes when i start the car.
 
Nick Wise said:
Next thing onthe list is to replacethe injectors. Talked to Jim Dunn while I was at Kirban's on Saturday and he agrees that is very possible where my problem is comming from. So I guess I will put an order in for 60# injectors and while I am at it I'll get a fuel pump and hotwire kit as well. was trying to put the fuel pump off since I had just done one im my Camaro last year, and I know how much fun they are. I guess they are not that bad when done on a lift with a couple other people around. But it does need to be done. Sounds a little funny sometimes when i start the car.
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Sorry I didn't see your last post before now, but like Jim Dunn said I would replace the injectors as that could very easily be your problem. Why are you going to go with 60lbs injectors? What turbo is on the car? You shouldn't need injectors that big if you're running a stock turbo.
 
That is just what he suggested. Said it would be fine for what I have, and plenty of fuel if I did any more mods to the car. Originally I was just going to get the 42#.
 
If your going to keep it stock something like a 009 injector is fine but if you ever plan to mod it and go fast 60's are the best out there. I've seen guys into the low 11's with 009's but it was squeezing every last bit of life out of them. The 60 is a great injector for these cars when you start bolting on the go fast stuff. :)
 
PhillyTurboSix said:
If your going to keep it stock something like a 009 injector is fine but if you ever plan to mod it and go fast 60's are the best out there. I've seen guys into the low 11's with 009's but it was squeezing every last bit of life out of them. The 60 is a great injector for these cars when you start bolting on the go fast stuff. :)
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Agreed. If you're planning on staying stock though I think I would just go with the 009s, if you plan on upgrading you can always sell them and you won't lose much on them.
 
who sells the 009's? For now I am going to try a set of stock ones that I know are good, and if that fixes the problem, I will order them.
 
Get the 60's. Do not listen to Jared on this one.

The 60's idle like stock and are hard to beat. Email Eric if you want a third opinion. :)
 
Eric sells some nice package deals on chips and injectors....

http://www.turbotweakstore.com/

I'm with Jason. Do the 60's and you'll never have to look back. I actually had a set in my totally stock 86 GN when I got it. I took those out and put 009's in it only because I had a set laying around and my 87 GN would like the 60's much better! :) Check out Eric and Racetronix. They are all good.
 
PhillyTurboSix said:
Eric sells some nice package deals on chips and injectors....

http://www.turbotweakstore.com/

I'm with Jason. Do the 60's and you'll never have to look back. I actually had a set in my totally stock 86 GN when I got it. I took those out and put 009's in it only because I had a set laying around and my 87 GN would like the 60's much better! :) Check out Eric and Racetronix. They are all good.
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For the TTA hotwire kit only use Racetronix. I would probably get the hotwire from Racetronix, the Walbro 340 from fullthrottle (to insure you get a new style non defective one), and the 60's from pick your choice. :thumbup:
 
Already odered the pump and hotwire kit from Full throttle. Thats also where I was going to get the injectors from. He seems to have some of the best prices. Especially when he has them on e-bay. also got my fuel pressure regulator form Full Throttle. My chip I of course got from Eric, along with my Scanmaster(he is about $10-$20 cheaper than anyone else).
 
Just tried the other set of stock injectors i borrowed from Matt. Didn't get to drive the car since it was dark and my tailights don't work (but that is a whole other issue).Seemed to run pretty good when I started it and checked for leaks. Idled the smoothest it ever has. Not going to say it is fixed yet, but I have my fingers crossed. planning on driving it tomorrow and friday to see if everything checks out. If so, I will put in an order for Injector/ chip combo from Eric.
 
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