Help!?!?

B

Bekillin

New member
Joined
Oct 17, 2012
Messages
5
Reaction score
0
Points
0
Location
Fort Bragg, NC
OK, so a few days ago I purchased an 86' Fiero GT Fastback. I met the guy took it for a test drive and everything seems mechanically functional at that time. Car does need alot of work though. So I get on the highway and i'm driving for about 1.2hrs doing 70-75mph and it just dies on me going down the road. I coasted to the shoulder and tried to crank the motor. Nothin... battery was totally dead. Bought a new battery and tried to crank again. YAY!! it turns over but will only stay running for less than a second before it kills itself. Figured it was a fuel delivery problem. So I bought a new fuel filter and while the outgoing was still disconnected i primed the fuel lines. YAY! again because its shoveling gas out. I reconnect all the lines and I also go through the trouble to remove the intake and the fuel rail and clean the injectors. I made sure that all the injectors still worked to. yell at me if you like but I just used 12v battery current to fire the injectors. I also visually inspected the fuel rail and blocked off holes while I blew through them, even ran some pipe cleaners down it. nothing special. But I put everything back together and went to crank again. Same problem, it will run for less than a second then kill itself. I did figure out though that if I feather the throttle I can keep it running, but as soon as I let off or try to engage the car or basically anything that requires me to not continuously feather the throttle it just dies again. I no longer know what to do. please help. ALL IDEAS WELCOME!!!!!!
 
Do a fuel pressure test. it may not be getting enough pressure to the injectors. blows everywhere from an open line though... also IF you have a distributor (i don't remember if the '86 does) check for good spark. a failing hall effect switch, under the rotor, will do similar.
 
Could it also have anything to do with compression? i really dont know but was just a thought. its not leaking anywhere under the car or in the engine bay. blown headgasket does not sound like my problem. also the guy i got the car from said he put a stage 2 cooling fan on the radiator and that the thermo that was installed is a 130deg. that sounds way to low since i have heard the fiero runs hot. and another thing, when i was driving the car before it broke down on me inside the car i can hear a pulsing vroom vroom (electrical) and my battery guage is constantly moving back and forth a couple of volts to the rythym of the sound. i would like to stop that, its very annoying. and could that have drained the battery? with the computer constantly thinking its about to overheat so its always running? and when i start it and feather the throttle it sounds mechanically sound other than the revving that im doing to keep it going, no knocks, smoke, or ticks. i cant even tell if its misfireing at all. im very confused because the car ran great and just out of no where died on the highway. Also i did a search all V6 engines 85-88 have distributors. its used quite commonly on many gm cars
 
There must be some DTCs set, from the sound of things. Can you get it to an Autozone or other store to get them read?
______________________________
 
The fan is on all the time if the a/c is on and if the Previous Owner didn't get the wiring right it can just stay on. the noise may be belt slip, which would cause voltage fluctuations and a weak battery also, check battery terminal, ground and starter connections. 130* is too cold and I'm surprised that the PO found one that low. low compression has very obvious symptoms and what you describe doesn't match.
 
'86 is obdI most stores won't/cant pull codes. You need to use a paper clip in the aldl port to get codes.
 
Your success with feathering the throttle leads me either to low fuel delivery or timing related. If you can keep it running by playing with the throttle, the A/F mix is off, your IAC is probably closed trying to enrich the mix. Better check the fuel pressure as bird suggested.
 
thanks everyone for the input, i am going to buy some test guages and a noid light and do some tests on the topics you posted. i will post any fails/success when im done but any further info you guys can think of is still very much welcome.
______________________________
 
Hello again, well I have good news! The fiero is now running and it sounds pretty smooth. no knocks, ticks or smoke. I replaced the fuel pump, strainer, and filter and whaa laa! And I believe you were right about the electonic sound inside the cab being the fuel pump, I no longer hear it inside the cab but all the lights on the vehicle still pulse. I was listening and under the hood I heard a click click going to the beat of the light surges. Its the fan relay. The previous owner did say he replaced it and also the stock fan was removed and a 2 stage cooling fan was installed. Im not sure of that or not because I have no idea what it would look like anyways. But it is that relay I believe that is causing the surges and when I started the car the fan instantly was on, I dont think it should do that until it reaches a certain temp right? Also the previous owner has wired up his own switch to shut the fuel pump off/on but when I dropped the fuel tank it had stock wires on them and looked as nothing had been touched since 1986. I wanted to fix it to where the fuel pump primes and functions the way it should and not constantly run with the switch on. I just think that is terrible for the fuel pump right? The switch is wired into the fuse box but I havent chased from where the switch goes afterwards. Really I just dont know why it was done in the first place but at least it runs now. Thanks to everyone for all the input you gave
 
You must log in or register to reply here.

Share this page

Back
Top