1986 Fiero SE Won't Run (Page 6/7)
buddycraigg OCT 12, 09:22 PM
Just so you know, I wasn't bashing you.
I was letting you know that we need accurate answers when we ask question, or it could throw us off with what we think is going on.
Waiting to hear what your pressure is when you get your gauge.
72and86 OCT 12, 11:41 PM

quote
Originally posted by buddycraigg:

Just so you know, I wasn't bashing you.
I was letting you know that we need accurate answers when we ask question, or it could throw us off with what we think is going on.
Waiting to hear what your pressure is when you get your gauge.



Ok well the gauge arrived and we tested it. This is the V6 engine.
Key on position : 5 psi,
Key starts car and constantly pumping the gas to keep it going; 15 psi. Obviously very low. We know gauge is reading right cause we put the line into a bottle and turned the key on and had a very low stream.

So its hard to believe we replaced a weak pump with a NEW weak pump. Needless to say we dropped the tank and I ordered a new fuel pump. Also checked the fuel filter, it was fine. Is there a way to accurately test the pumps before installing them. I know I can get it to run but...?
skywurz OCT 13, 12:15 AM
That sounds like you got a L4 pump not a v6 pump
buddycraigg OCT 17, 02:42 AM
I have to agree that you have very low fuel pressure. I think the V6 is supposed to be about 35.
Could be the wrong pump.
Could be a bad fuel pressure regulator. (I don't think I have ever seen one go bad)

[This message has been edited by buddycraigg (edited 10-17-2021).]

buddycraigg OCT 17, 02:54 AM

quote
Originally posted by 72and86:
We know gauge is reading right cause we put the line into a bottle and turned the key on and had a very low stream.



I don't like this statement.
both the 4 and 6 pumps move a lot of volume. it has nothing to do with pressure.
We might be fighting a restriction somewhere.
I'm not thinking that right now, but want to keep it in the back of our minds.
72and86 OCT 17, 11:18 AM

quote
Originally posted by buddycraigg:


I don't like this statement.
both the 4 and 6 pumps move a lot of volume. it has nothing to do with pressure.
We might be fighting a restriction somewhere.
I'm not thinking that right now, but want to keep it in the back of our minds.



We will see. I definitely got the wrong pump. Hopefully I get the pump Monday, install Tuesday...
72and86 OCT 21, 10:47 AM
Ok. So here's whats happened.
We installed a new "correct" fuel pump. Neg battery was disconnected. After install, I hooked up battery and the car started but idled at a crazy high RPM like 3200, The idle also surged way up and down!
At least it didnt die which was our initial problem. And the SES light came on with the high idle. Code 22 ; TPS.

We changed out the "new" TPS for the old and same result. Crazy, High idle.
We changed out the "new" IVC for the old and same result. Crazy, High idle.
I disconnected the battery to clear the code. Reconnected.

With old ICV and TPS in, I tried to start the car and 3 or 4 attempts it wouldn't start. Crank, no start. Wouldn't turn over...! Argggh.
We waited a few minutes and tried and IT STARTED! Idle was little high but was smooth! After a few moments the idle came down to what sounded like 900-1000. The tach read 1500, which we know is wrong.
(I know my tach is off due to common problem in calibration as Ive found out through research...)
I think we finally solved this but I haven't road tested it yet cause its on jack stands for the gas tank extraction.

So through all this nightmare it appeared I had a failing fuel pump and we unknowingly replaced it with a "wrong fuel pump". Im keeping my fingers crossed we fixed it.

[This message has been edited by 72and86 (edited 10-21-2021).]

buddycraigg OCT 23, 10:52 PM
Sorry I am late back to the party.
It has been 2 days.
How is it going now?
72and86 OCT 24, 10:34 AM

quote
Originally posted by buddycraigg:

Sorry I am late back to the party.
It has been 2 days.
How is it going now?



Have you read my post above yours? Thats where Im at. I haven't taken it off jack stands because its at a nice height for buffing paint.

[This message has been edited by 72and86 (edited 10-24-2021).]

buddycraigg OCT 26, 12:14 AM
yes, your post was 2 days before mine.
I wondered if there had been any new news.