Rescuing my dads old Fiero GT 1987 (Page 22/23)
Repulsiv AUG 01, 09:54 PM
Powering up a dry/empty fuel pump sounds dangerous, but I can see the point.

Is there any reason to remove the pulsator ? does it usally create troubles ?

[This message has been edited by Repulsiv (edited 08-01-2019).]

Rexgirl AUG 02, 03:32 AM
Leaving the pulsator in is often fine. Some people remove them and if so, it's important to use the proper hose as regular fuel injection hose will break down in this application.

It's unlikely that your filter sock would limit the fuel flow enough to cause your symptoms, but anything is possible. Given how difficult removing the Fiero's fuel tank is, most of us typically replace the pump with a new unit to maximize reliability. Our fuel pumps often experience problems after sitting for long periods.
Repulsiv AUG 04, 10:27 AM
%(&(()=()=& !!

DAMN CAR.. now I filled it with fresh fuel and started it, it goes EXACTLY as before

It goes fine on idle and if I rev it slowly, as soon as I push the pedal too fast it misfires heavily.

Now I replaced more or less everything about the ignition system, including the ignition module and pickup coil, cables, rotor, dist cap..
AND I replaced the fuel pump, fuel strain and fuel filter. ..and the fuel..

I dont know what to do.. what can it be ? fuel pressure regulator ? ..I have no idea.

I recorded a little movie too how it reacts but i havent uploaded it anywhere..

The strange thing is that it ran really fine for like 40km after I got the car, then this suddenly started.

I seriously thinking about putting out an ad for it and sell it as it is, the car clearly does not like me at all

[This message has been edited by Repulsiv (edited 08-04-2019).]

Rexgirl AUG 04, 07:14 PM
It really sounds like a weak spark or a fuel pressure problem. You Did change the ignition coil, didn't you?

Yes, it could be a fuel pressure regulator, maybe, and if you could get a Schrader adapter for your gauge you could record the FP with your phone while accelerating. . Checking for fuel or it's smell in the pressure gauge's vacuum line (it connects to the t-fitting off the passenger side plenum) might show a failed diaphragm.
Anyone, I forget, is it possible to look at the O-2 sensor data with a scanner?
Easy8 AUG 04, 08:33 PM
OK here is something to look at... From what I can get your car starts and idles fine but when you give it gas it misfires. Have you tried to drive it like this at all?? You mention a few pages ago when you down shifted the car "boomed" or backfired on a test drive. I had a fiero a few years back that lost power on the freeway.. would idle but basicly die when you tried to drive it. In the end.. long story I am sure you do not want to hear. The reason was the catalic converter had broken internaly and was blocking most of the exhaust. When the motor tries to move alot of air it gets to much back pressure and does not allow for fresh air to enter the engine. Replaced the cat and the car ran fine. Now I am not saying run out and get a new cat.. that costs to much. See if you can disconnnect the exhaust from infront of the cat and run the car. Be carefull of the hot exhaust and where it is going... it can start a fire. It may be the backfiring has broken the insides of the cat lose. So if it does fix the issue you need to look into that.

You have put to much in the old girl to stop now.. keep at it and you will be the talk of the town in your sweet Fiero.
Rexgirl AUG 05, 04:20 PM
One way the members here have used to check for a blocked catalyst is to temporarily remove the O-2 sensor.
Repulsiv FEB 12, 06:05 PM
Long time, no update..

To make a long story short.. my girlfriend went crazy and moved away, and I had to spend a lot of time and money to fight in court (still not finished),
and buy her out from the house and well.. She also claimed ownership of the cars including the fiero and I had to fight about that too. Well well, happened a lot of bad and boring stuff
but it ended with me owning the house and cars, but having very little money left.

Anyway that meant that I really havent had any time, money or energy to work on the fiero, its still in the air and havent been on ground since the change of fuel pump, that would be 3 years ago or so.

But now I plan to get it working again.. I tried to start it just before winter came, but the battery was dead (even if it have been on charge all the time with a suitable charger, but the battery was very old.)
and then I didnt do anything more.

Now I have another battery (that I think works) and also I bought myself a fuel pressure tester, I really hope it fits, but it should.

So as soon as the snow is gone and its a bit warmer I plan to work on the car again.


Glenn

------------------
Smoke me a kipper, I'll be back for breakfast!

Skybax FEB 12, 07:53 PM

quote
Originally posted by Repulsiv:

%(&(()=()=& !!

DAMN CAR.. now I filled it with fresh fuel and started it, it goes EXACTLY as before

It goes fine on idle and if I rev it slowly, as soon as I push the pedal too fast it misfires heavily.

Now I replaced more or less everything about the ignition system, including the ignition module and pickup coil, cables, rotor, dist cap..
AND I replaced the fuel pump, fuel strain and fuel filter. ..and the fuel..

I dont know what to do.. what can it be ? fuel pressure regulator ? ..I have no idea.

I recorded a little movie too how it reacts but i havent uploaded it anywhere..

The strange thing is that it ran really fine for like 40km after I got the car, then this suddenly started.

I seriously thinking about putting out an ad for it and sell it as it is, the car clearly does not like me at all




You didn't mention the ignition coil, often overlooked and will exhibit those types of symptoms, and trick people into chasing a phantom fuel problem. A good aftermarket replacement coil is Standard Blue Streak made in Poland and cost about $35.
Skybax FEB 12, 07:54 PM

quote
Originally posted by Repulsiv:

Long time, no update..

To make a long story short.. my girlfriend went crazy and moved away, and I had to spend a lot of time and money to fight in court (still not finished),
and buy her out from the house and well.. She also claimed ownership of the cars including the fiero and I had to fight about that too. Well well, happened a lot of bad and boring stuff
but it ended with me owning the house and cars, but having very little money left.

Anyway that meant that I really havent had any time, money or energy to work on the fiero, its still in the air and havent been on ground since the change of fuel pump, that would be 3 years ago or so.

But now I plan to get it working again.. I tried to start it just before winter came, but the battery was dead (even if it have been on charge all the time with a suitable charger, but the battery was very old.)
and then I didnt do anything more.

Now I have another battery (that I think works) and also I bought myself a fuel pressure tester, I really hope it fits, but it should.

So as soon as the snow is gone and its a bit warmer I plan to work on the car again.


Glenn




Sorry to hear, hope you have brighter days ahead this coming springtime.
Repulsiv FEB 13, 06:54 AM

quote
Originally posted by Skybax:


You didn't mention the ignition coil, often overlooked and will exhibit those types of symptoms, and trick people into chasing a phantom fuel problem. A good aftermarket replacement coil is Standard Blue Streak made in Poland and cost about $35.



No I did not replace that, but it seem to work fine.. but you never know.

Not sure if I ever posted that film of how it goes, have to look it upp, it really go fine, on all rpms, its just when you try to accelerate fast it misfires.

if you accelerate slooowly you can easilly get it up in illegal speeds, and high rpm's..


Edit: here is the film.. https://www.youtube.com/watch?v=AMFkbR8CSpc

[This message has been edited by Repulsiv (edited 02-13-2022).]