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#1 |
Registered Member
Join Date: Dec 2006
Posts: 2
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![]() I have a 1990 5.0 Mustang that has developed a high-load, low-RPM miss. The miss is most noticable at WOT below 2000 RPM and goes away with increasing RPM. My guess is that it is ignition related. I have replaced the plugs, wires, distributor cap, rotor, coil, and the TFI module with no success. It has slowly gotten worse over time.
Any suggestions would be appreciated. Thanks, Jeff |
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#2 |
Conservative Individualist
Join Date: May 1997
Location: Wherever I need to be
Posts: 7,487
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![]() This is a tech question and should be moved to the Windsor Power forum.
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5.0 Mustang Owner 1990 - 2005 |
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#3 |
Moderator
Join Date: Sep 1998
Location: Grand Rapids, Michigan, USA
Posts: 1,001
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![]() No problemo.
![]() Mebbe you're leaning out. Is it just when the engine is at operating temperature, or all the time? Have you tested the MAF sensor?
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Capri306, Moderator The Mustang Works Online 1979 Mercury Capri 1987 5.0L Mustang LX Notchback 1993 5.8L Eddie Bauer Bronco ![]() |
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#4 |
Registered Member
Join Date: Dec 2006
Posts: 2
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![]() The miss appears to be independent of engine temperature. The mass airflow sensor was replaced a couple of years ago. It's the most noticable in 5th gear.
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#5 |
Registered Member
Join Date: Apr 2001
Location: Gallatin, Tn
Posts: 1,326
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![]() Sounds like timing. What's it set at right now?
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#6 |
Registered Member
Join Date: Aug 2002
Location: SanAntonio, Tx
Posts: 957
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![]() Any mods?
If you have aftermarket rockers, adjustment could be out, you could be losing compression? just a guess. Also, sounds ignition related, but it could be a weak fuel pump, you need to be sure your getting fuel pressure. And that you dont have a defected coil, even if it's new. Check engine grounds, and see if you can run a code scanner, and pull codes. could be a number of things, clean the maf, i dont care if it's new, and make sure all injectors are squirting. good luck..
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X-Texas highway patrol ssp 1990 coupe - exploder Gt-40 iron heads, Explorer intake, 19 lber's. E-cam. crane 1.7 rollers. 190fp. 75mm maf. 65mm tb, tubular subframe connectors, mac cai, Asp crank pulley, T-5, king cobra clutch, flowtech 1-5/8 unequals, mac X-pipe Frpp driveshaft, lakewood Lca's. race weight 3,160 12.69 @ 107.35, 1.71 60' 26x8.5 drag's 3.90 gear 13.20 @ 106.91 - 235/60/15 firestones 2.3 60' 3.27 gear |
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#7 |
Registered Member
Join Date: May 1999
Posts: 5,246
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![]() Is it an audible misfire (backfire?) Does it clear itself out after a few pops?
Either one of those scenarios sound you could have a broken or failing fuel injector. |
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