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Author Topic: Running out of fuel or air  (Read 15758 times)

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Wreck It Ralph

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Running out of fuel or air
« on: December 23, 2020, 05:01:49 pm »
So I’ve noticed at 4,000 RPM I’m running out of fuel or air. I’ve run plenty of cleaner through but I know I need to rebuild the tbi and change the fuel filter.

First off where is the fuel filter on the 88 2.5? I haven’t crawled underneath yet.

Second, can you get a slightly bigger injector?

Should I be looking for other problems

I know Pat said it runs out of air at 4500 but this feels too soon.
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1988 Fiero Base 4cyl 5spd.
1986 Fiero GT ... Parting out. Let me know if you need something.

Fierofool

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Re: Running out of fuel or air
« Reply #1 on: December 23, 2020, 05:20:01 pm »
The lower end doesn't like revs over 4500, either.  The 88 is a little more forgiving due to the counterbalance shafts.

The fuel filter is mounted onto the back firewall near the rear end of the fuel tank on the V6's, but it's inline right there at the air cleaner on the Duke.  Left side right in plain view toward the left end of the engine.  Could be part of your problem if there's no filter.  Sediment is getting through to the injector. 
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GTRS Fiero

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Re: Running out of fuel or air
« Reply #2 on: December 23, 2020, 05:38:17 pm »
Yes, L4 fuel filter is very visible and accessible.  Right on top.
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Wreck It Ralph

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Re: Running out of fuel or air
« Reply #3 on: December 23, 2020, 05:46:33 pm »
Not on mine. 😂
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1988 Fiero Base 4cyl 5spd.
1986 Fiero GT ... Parting out. Let me know if you need something.

Fierofool

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Re: Running out of fuel or air
« Reply #4 on: December 23, 2020, 06:00:44 pm »
You don't need a larger injector even if one is available.  The one you have is enough to support any HP gains you might get from it.  The O-2 sensor will tell it to kick in more fuel if it starts to lean out. 
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There are three kinds of men:

1.    The ones that learn by reading.
2.    The few who learn by observation.
3.    The rest of them have to pee on the electric fence and find out for themselves.    Will Rogers

GTRS Fiero

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Re: Running out of fuel or air
« Reply #5 on: December 23, 2020, 06:01:17 pm »
Hmmm.  I was hoping get you to do an L4 locations article.
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GTRS Fiero

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Re: Running out of fuel or air
« Reply #6 on: December 23, 2020, 06:02:32 pm »
In the image below, the fuel filter is slightly below the middle, on the left side.
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Wreck It Ralph

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Re: Running out of fuel or air
« Reply #7 on: December 23, 2020, 06:04:13 pm »
Well I was looking the other direction. 😂 I thought I was following the fuel lines. 😂 I’ll look tomorrow
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1988 Fiero Base 4cyl 5spd.
1986 Fiero GT ... Parting out. Let me know if you need something.

Wreck It Ralph

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Re: Running out of fuel or air
« Reply #8 on: December 23, 2020, 06:04:59 pm »
Quote from: GTRS Fiero on December 23, 2020, 06:02:32 pm
In the image below, the fuel filter is slightly below the middle, on the left side.

Wait. My bay doesn’t look like that.
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1988 Fiero Base 4cyl 5spd.
1986 Fiero GT ... Parting out. Let me know if you need something.

GTRS Fiero

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Re: Running out of fuel or air
« Reply #9 on: December 23, 2020, 06:05:13 pm »
Quote from: Wreck It Ralph on December 23, 2020, 05:01:49 pm
So I’ve noticed at 4,000 RPM I’m running out of fuel or air. I’ve run plenty of cleaner through but I know I need to rebuild the tbi and change the fuel filter.

First off where is the fuel filter on the 88 2.5? I haven’t crawled underneath yet.

Second, can you get a slightly bigger injector?

Should I be looking for other problems

I know Pat said it runs out of air at 4500 but this feels too soon.

You need to get that thing hooked up to a computer to see what's going on.
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GTRS Fiero

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Re: Running out of fuel or air
« Reply #10 on: December 23, 2020, 06:05:37 pm »
Quote from: Wreck It Ralph on December 23, 2020, 06:04:59 pm
Quote from: GTRS Fiero on December 23, 2020, 06:02:32 pm
In the image below, the fuel filter is slightly below the middle, on the left side.

Wait. My bay doesn’t look like that.

Huh?  How does it look?
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GTRS Fiero

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Re: Running out of fuel or air
« Reply #11 on: December 23, 2020, 06:06:06 pm »
Quote from: Wreck It Ralph on December 23, 2020, 06:04:13 pm
Well I was looking the other direction. 😂 I thought I was following the fuel lines. 😂 I’ll look tomorrow

That is the fuel line.
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Wreck It Ralph

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Re: Running out of fuel or air
« Reply #12 on: December 23, 2020, 06:07:13 pm »
I’m looking when I get home tonight.
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1988 Fiero Base 4cyl 5spd.
1986 Fiero GT ... Parting out. Let me know if you need something.

Fierofool

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Re: Running out of fuel or air
« Reply #13 on: December 23, 2020, 06:19:02 pm »
If you are looking for a larger injecctor, one from one of these cars might flow a little more.  The throttle bodies are interchangeable with the 87 and 88.


'87-88 2.5L Throttle bodies from the following will fit:

   Buick Skylark       '87  2.5L
   Buick Somerset      '87  2.5L
   Olds Calais         '87  2.5L
   Pontiac Grand Am    '87  2.5L
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There are three kinds of men:

1.    The ones that learn by reading.
2.    The few who learn by observation.
3.    The rest of them have to pee on the electric fence and find out for themselves.    Will Rogers

Wreck It Ralph

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Re: Running out of fuel or air
« Reply #14 on: December 23, 2020, 06:22:39 pm »
Quote from: Fierofool on December 23, 2020, 06:19:02 pm
If you are looking for a larger injecctor, one from one of these cars might flow a little more.  The throttle bodies are interchangeable with the 87 and 88.


'87-88 2.5L Throttle bodies from the following will fit:

   Buick Skylark       '87  2.5L
   Buick Somerset      '87  2.5L
   Olds Calais         '87  2.5L
   Pontiac Grand Am    '87  2.5L

I would like an entire TBI to play with. My friend want to try to enlarge the intake.
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1988 Fiero Base 4cyl 5spd.
1986 Fiero GT ... Parting out. Let me know if you need something.
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