Im glad to see a good number of Daytona owners who have a forum to discus their cars.

Im new to this so:

Hi Everybody

I have had 4 Daytonas, 1 es and the rest Shelbys; all awesome cars.

But I am in need of some help.....

I have my 87 shelby with a 89 t2 it is running great up to 4000rpms and about 8-10 psi of boost, it then falls on its face and then kicks back in and then falls on its face again over and over and over. I have put a new exhaust and fuel pump in and the problem is still there, it doesnt do it everytime but it does it alot. Anybody got any ideas? The only thing I can think of is maybe its time for a new turbo..

Thanks

sperk1971

 

Sounds like fuel starvation/detonation to me.

What octane fuel are you running?

 

You 87 Shelby Z will not have balance shafts. The only engines that got them where the 2.5 tbi/turbo and the 2.2 VNT turbo engines.

I think, but I'm not sure, I think the o2 is a wide band. I would have to consult the FSM on that one.

 

I am running 89 octane, the car has been sitting awhile and I decided to get it out to drive this summer. It had the problem when I put it up, but I always thought it was the exhaust. My mechanic just put a new fuel pump on for me and I asked him if it was a pump for a 89 shelby and he said it didnt matter they all carry the same pressure......, I thought the shelbys got higher output fuel pumps.

thanks for the quick reply

 

You should run 92 octane in it just to keep it happy. Have you ever replaced the fuel filter? It sounds like the fuel flow is sufficient until the demand is great enough and a dirty filter will cause a throttle hickup where it falls on it's face and then picks back up just to fall on it's face again, over and over. The debris is getting pushed into the filter and then the pressure falls off between pump cycles letting the debris fall away from it until the pump forces it back into it again causing the stumble off and on. This is just one possibility though.

 

I bought mine at a local turbo shop, Ohio Cooler & Turbo I believe. I believe it was a rebuilt turbo and not a new one, but it was several years ago so I do not recall exactly which it was.

 

Thanks for the idea, I will give it a try this morning. Again thanks for the reply.

sperk1971

 

90 Daytona ES 3.0L

I call her Shodan. Had it for a real long time, and always doing something new to it. Am kind of curious if anyone has ever done anything different to the interior. Like modify the dash or something.

 

well I put some new gas in and a new filter, then realized I had made a leak in my fuel line, sadly after replacing the line I am still having trouble. But the car has been sitting for 3 years; maybe I just need to drive it a bit to loosen it up.

 

It wouldn't hurt then to try running some injector cleaner thruogh it as well. Did you ever put a fuel stabilizer in it before or during it's 3 years of sitting? Gasoline will turn into a thick varnish like substance after a long period of time like that. Run injector cleaner through it, the injectors are probably gummed up inside from it causing reduced performance and fuel flow.