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2.9 L misfire above 2200 RPM - Is my MAP sensor bad?


Uncle Gump

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rusty ol ranger

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Is anyone finding any fixes for this? My 1988 ford ranger xlt 2.9l v6 is missing bad at around 2200 to 2500 rpm and tach is jumping all over the place also bogging bad when I mash the go pedal codes 86 and 89 keep coming up. I've gone through 6 icm new distributor, cap rotor plugs wires 2 coils all new relays new relay pigtails new iac and tps new intake air temp sensor new engine temp sensor tried a different known good ecm I have new injectors but haven't tried that yet. It'll idle for hours without missing a beat doesn't smoke or idle rough. I've been looking for weeks for a new wire harness but cannot find one at all without being scammed "yes I got scammed out of $225 for a used harness out of illinois" can anyone help with this?
Check the plug pigtail that plugs into the coil. Your tach jumping around points to an electrical issue. The wires inside the plug like to corrode and break or whatever. A new pigtail for that is like 12 bucks.

Start there and report back.

Also code 86 is for a shift solenoid related to an auto trans, and 89 is something with AIR injection which the 2.9 dont have. Atleast according to the list i found online.

Did you use an actual code reader or try doing it with blinking lights or a voltmeter?
 
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oicunow

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Yea I bought the 3/4 solenoid and yes I used an actual reader also the pig tail was replaced and is clean l. It's like the pip out is messed up coming out of the ecm
 

franklin2

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Yea I bought the 3/4 solenoid and yes I used an actual reader also the pig tail was replaced and is clean l. It's like the pip out is messed up coming out of the ecm
The PIP signal is shielded so it will not pick up ignition noise. The shield on the distributor end needs to be intact and not shorting on any bare wires, and not touching anything metal. The shield should only be grounded on the PCM end of the harness.
 

oicunow

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I checked the foil around the wires it is only grounded at the pcm I believe it's like pin 40 or something like that but yes it's only grounded at the one end and about 2 inches from the icm isn't touching any metal
 

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