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Old 07-27-2013, 12:21 PM   #1
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89 mustang loosing power

So my 89 gt looses power around 2800-3k rpm, rpm goes up really slow after 2800
Things I've done cleaned up mass sensor changed spark plugs and coil.
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Old 07-27-2013, 01:34 PM   #2
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F/p is at 30
F/p vaccum off 38-40
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Old 07-28-2013, 11:11 PM   #3
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Do you have a vacuum leak anywhere (that is a a big one on these cars)

Check and reset timing

---------- Post added at 11:11 PM ---------- Previous post was at 11:10 PM ----------

It could also be a fuel delivery issue
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Old 07-28-2013, 11:27 PM   #4
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Quote:
Originally Posted by Billymich View Post
Do you have a vacuum leak anywhere (that is a a big one on these cars)

Check and reset timing

---------- Post added at 11:11 PM ---------- Previous post was at 11:10 PM ----------

It could also be a fuel delivery issue
How and where do I check for a vacuum leak.?
My friend checked my timing yesterday around noon he said it was at 12*
Also that same day he disconnected the MAF sensor and the car would die unless u held the gas and today I went to buy maf cleaner and cleaned it and when I unplugged it this time the car stayed on without the maf connected
Also does my f/p seem right.?
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Old 07-28-2013, 11:36 PM   #5
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Well Vacuum leaks are essentially unmetered air getting into your engine.

They can be as a result of a leaky gasket, or improperly torqued bolt/nut, or a cracked vacuum line (the tan/white hard plastic lines running on the passenger side of the engine/ the soft black plastic tubes running from your intake to the firewall (and a number of other places))

Your engine pulls in air creating a pressure differential (or vacuum) and so if everything is not nice and tight air gets pulled not only through your
filter-->MAF-->throttlebody-->intake-->Combustion chamber
but also from other places.

It sounds like if you pucker your lips and pull air in really hard. Sometimes on small one you can't hear it at all.

If you have some vacuum tubing lying around(or its cheap at auto/hardware stores) you can put one end in your ear and take the other end and move it all around the engine bay, upper and lower intake (especially around mating surfaces), injectors, vacuum tubes, etc etc

---------- Post added at 11:36 PM ---------- Previous post was at 11:31 PM ----------

Vacuum leaks are USUALLY accompanied by high idle
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Old 07-28-2013, 11:41 PM   #6
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Quote:
Originally Posted by Billymich View Post
Well Vacuum leaks are essentially unmetered air getting into your engine.

They can be as a result of a leaky gasket, or improperly torqued bolt/nut, or a cracked vacuum line (the tan/white hard plastic lines running on the passenger side of the engine/ the soft black plastic tubes running from your intake to the firewall (and a number of other places))

Your engine pulls in air creating a pressure differential (or vacuum) and so if everything is not nice and tight air gets pulled not only through your
filter-->MAF-->throttlebody-->intake-->Combustion chamber
but also from other places.

It sounds like if you pucker your lips and pull air in really hard. Sometimes on small one you can't hear it at all.

If you have some vacuum tubing lying around(or its cheap at auto/hardware stores) you can put one end in your ear and take the other end and move it all around the engine bay, upper and lower intake (especially around mating surfaces), injectors, vacuum tubes, etc etc

---------- Post added at 11:36 PM ---------- Previous post was at 11:31 PM ----------

Vacuum leaks are USUALLY accompanied by high idle
The car idles fine but ill get a vacuum line 2morrow and check
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Old 07-28-2013, 11:45 PM   #7
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Yeah, do that, its cheap and always handy.

Also Go ahead and reset your idle while you're doing that and check your TPS voltage if you have a multimeter or voltmeter

Is your filter good and clean?

---------- Post added at 11:45 PM ---------- Previous post was at 11:44 PM ----------

Sorry, I've never heard of F/P

OHHHHHH fuel pressure haha 30 sounds ok at idle but hopefully scotty or someone else knows because I'm not sure
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Old 07-29-2013, 12:01 AM   #8
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Quote:
Originally Posted by Billymich View Post
Yeah, do that, its cheap and always handy.

Also Go ahead and reset your idle while you're doing that and check your TPS voltage if you have a multimeter or voltmeter

Is your filter good and clean?

---------- Post added at 11:45 PM ---------- Previous post was at 11:44 PM ----------

Sorry, I've never heard of F/P

OHHHHHH fuel pressure haha 30 sounds ok at idle but hopefully scotty or someone else knows because I'm not sure
How do I reset my idle.?
Ok I'll check the tps 2morrow as well
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Old 07-29-2013, 12:08 AM   #9
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32-34psi at idle
40psi WOT

---------- Post added at 12:08 AM ---------- Previous post was at 12:07 AM ----------

Ford Mustang :: 5.0 Idle Adjustment
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Old 07-29-2013, 12:23 AM   #10
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As was said check for vac leaks and clean your sensors. Also when was the last time you changed your fuel filter? Could be the pump going out too, 30 is a little low at idle...
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Old 07-29-2013, 12:33 AM   #11
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Quote:
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As was said check for vac leaks and clean your sensors. Also when was the last time you changed your fuel filter? Could be the pump going out too, 30 is a little low at idle...
I've never changed it in the past year that i had it and I think my dad hasn't changed it either but ill ask
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Old 07-29-2013, 12:53 AM   #12
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Its cheap and phenomenally easy to change. A must do if you have had bad fuel recently or if the car sat for quite some time
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Old 07-29-2013, 01:14 AM   #13
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Quote:
Originally Posted by scottydsntknow View Post
As was said check for vac leaks and clean your sensors. Also when was the last time you changed your fuel filter? Could be the pump going out too, 30 is a little low at idle...
30 would be about right with the vacuum line attached. He stated it was 38- 40 with the line detached which is the proper way to check it.
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Old 07-29-2013, 10:37 AM   #14
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Gah I missed that part. Yeah with the line attached its right. My 95 was set right at 40 with the AFPR when I took it in for the dyno tune.
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