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Registered
1988 XLT, 351w, C6, Manual Tcase, Manual hubs, 31x10.5x 15 Stock suspension, no lift yet.
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10 Posts
Discussion Starter #1
It is popping back when under a load. Best place to beginning to find out cause?

Runs smooth otherwise.

Blessings,

Mike
 

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Super Moderator
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24,658 Posts
Yo Mike,
Try a Self Test for Diagnostic Trouble Codes by my pal, BroncoJoe19 @ Code Reader.....
PCM stores the Self-Test program in permanent memory. When activated, Self-Test checks the EEC system by testing memory integrity and processing capability, and verifies that various sensors and actuators are connected and operating properly.

Inspect the air cleaner and inlet ducting to throttle body.
Check all engine vacuum hoses for damage, leaks, cracks, blockage, proper routing, etc. Check EEC system including the wiring harness for proper connections, bent or broken pins, corrosion, loose wires, proper routing, etc.
Check the Powertrain Control Module (PCM), sensors and actuators for physical damage, such as IAC, TPS, ICM, MAP,, etc.
Check the engine coolant for proper level and mixture.
Check the transmission fluid and engine oil level and quality. Make all necessary repairs before continuing with SELF TEST.

The engine temperature must be greater than 50° F for the Key On Engine Off (KOEO) Self-Test and greater than 180° F for the Key On Engine Running (KOER) Self-Test. Run it around to heat the engine up and shift thru all gears including Reverse. Make sure A/C is off and transmission is in Park (automatic); or in Neutral for a Manual and; release clutch. Then turn off engine, all accessories/lights (close driver's door) , etc.

Do KOEO test First. Post Code(s) here according to KOEO and KOER.

A helper can assist you by counting the codes. Some use their smart phones to record them.

BEWARE OF FAN, BELTS, PULLEYS, HOT HOSES, IGNITION HIGH TENSION WIRES, AND ENGINE COMPONENTS⚠

Or ask local mom and dad parts stores if they will test it for you.

Or purchase a coder reader such as Equus 3145 Innova OBD I Code Reader for Ford EEC IV Engines at Walmart & most parts stores.

□•□
Would you consider it a backfire?
In following table, Quick Test is the Self Test for Diagnostic Trouble Codes
159679


Spark Plug Wire Routing & Firing Order TSB 94-04-10 for 87-93 5.0 & 94-96 5.0 & all 5.8 - engine miss, spark knock, buck/jerk, surge and other driveability concerns
Source: by Ford

See my Vacuum leak test in post #11 incl some jowens126 HVAC Control Panel pics/info @ Help with dtc codes and idle
Excerpts:
Borrow or purchase a vacuum gauge and read this Vacuum Gauge Diagnosis @
1996 Bronco/F-Series
Similar to other EFI years.
One way to do a quick check is to grab a vacuum gauge. Some parts stores will loan you a gauge with refundable deposit.
And see EFI High Idle Tips by Mikey 350
Al
 

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Registered
1988 XLT, 351w, C6, Manual Tcase, Manual hubs, 31x10.5x 15 Stock suspension, no lift yet.
Joined
·
10 Posts
Discussion Starter #3
Thanks, will work on these today!
 
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