Towboater

Hello, I've tried reading quit a few of the threads that envolve engines " falling on its face at WOT" and I'm still confused. Most of the posts talk about being to much or to little fuel amount and adjusting fuel pressure regulater, my car is a plane Jane stock 350 tpi I don't have all that fancy stuff can someone please help

Jonesyfxr

iTrader: (2)

Go get or rent a fuel pressure kit. Run the hose into window or where you can view while driving. Run it and watch the pressure. Most likely you may need a regulator or maybe the pump is failing.

It's a start.

Towboater

Ok I'll try that, I checked to see how much pressure it had at the little stem on the fuel rail and it shot straight up and was hitting the bottom of the hood lol so I figured it was ok

someone972

iTrader: (2)

What codes is it setting when the check engine light comes on? You can search the forum for how to pull them, all you need is to jump a terminal on the ALDL connector with a paperclip and it will blink the codes at you. They will be a great start at figuring out exactly what's going wrong.

EDIT: And I almost forgot to mention, even when the SES light turns off when you turn the car off and on, the code is still stored for you to retrieve.

Towboater

I tried that before and I recognized the normal code 12 and then it started the other code but I couldn't quite figure it out, all I know is it was blinking in a sequence of 3 flashes, I'll try it again tomorrow tho

irockid43

A fuel pressure gauge would be a great idea, but I would test it in park (you might find your problem there).

But first I would get a service manual at a parts store, check your codes, and go from there.

It sounds like you might have a code 33. Double check it and get back to us.
Good luck!

mantaguy

iTrader: (5)

Each code will blink 3 times,starting and ending with the 12 code

Towboater

Well fellas car runs like a raped ape today... Took it down the road after work today to the part store. I bout me a fuel pressure tester and it's running 37 psi at idle, didn't get to take it on the road with the gauge hooked up tho to see what it did on the highway due to a pregnant wife that needed help lol. I'll be sure and run it tomorrow tho. One more quick question... I noticed when I shut the car off the pressure slowly drops till it gets to about 10 psi then it's stationary.... Is this a sign of leaking injector o rings perhaps??? Cause it seems if I drive it and shut it off for about 20 min and start it again it just don't hit when u turn the key like it's supposed to, takes about 3 to 4 seconds of cranking before it fires of.. But when it's cold from sitting overnight I can barely bump the key and it hits, thanks everyone

someone972

iTrader: (2)

Unless you see/smell gas on the injectors, it wouldn't be leaking o-rings (at least not top side, you could still have vacuum leaks on the bottom). It could possibly be leaking injectors, but it could also be a leaking fuel-pressure regulator, or a bad check valve in the fuel pump. The way to figure out which it is would be to hook up the fuel pressure gauge, jump the fuel pump, and then clamp off the return or supply lines and see what happens. Be sure to stop the fuel pump from running as soon as you have your lines clamped off, you don't want to damage it by running it too long. If:
Supply + Return is clamped and it still falls: Leaky injectors.
Supply is clamped off and it doesn't fall anymore: Bad check valve in fuel pump.
Return is clamped off and it doesn't fall anymore: Leaking fuel pressure regulator.

Towboater

Ok finally got a chance to tinker a little bit ran the code and its a code 48 for misfire diagnosis... My question is if it's a misfire.. Then why isn't it doing it all the time?? Why does it run fine again when I shut the key off and start the car again? Can somebody intrigue me on this?