Engine cuts out/tach drops
Thread Starter
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2nd Gear
Joined: Apr 2024
Posts: 2
Likes: 0
From: Pennsylvania
Engine cuts out/tach drops
Hi! I'm new here but not to trucks.
My son has a 1990 F150 with a 5.0.
Does anyone have any experience with an engine cut out at idle and or light throttle?
No engine light, fresh tune up and fresh igntion module.
My son has a 1990 F150 with a 5.0.
Does anyone have any experience with an engine cut out at idle and or light throttle?
No engine light, fresh tune up and fresh igntion module.
Hotshot
Joined: Jul 2020
Posts: 10,536
Likes: 2,664
From: Near Salt Lake City
Yes, most of us have
The capacitors in the processor need to be checked
You should check the EEC 4 codes in case that can send you in a correct direction
Codes like 15 and 18 are processor related
You could try running it around with the spout plug out
Could be a lean issue, a bad injector, just about anything
The process of elimination is your friend
You can do an old fashioned cylinder balance test
Pull each plug wire off at idle one at a time and verify the RPM drop
Things like that help
You said tune up. Did you replace the wires and the cap and rotor?
The capacitors in the processor need to be checked
You should check the EEC 4 codes in case that can send you in a correct direction
Codes like 15 and 18 are processor related
You could try running it around with the spout plug out
Could be a lean issue, a bad injector, just about anything
The process of elimination is your friend
You can do an old fashioned cylinder balance test
Pull each plug wire off at idle one at a time and verify the RPM drop
Things like that help
You said tune up. Did you replace the wires and the cap and rotor?
Logistics Pro
Joined: Nov 2013
Posts: 3,928
Likes: 1,199
From: Mojave, Ca
Do any of your other gauges instantly flicker when the engine cut out?
Yes=ignition switch on top the steering column is failing.
No=Profile ignition pickup sensor inside the distributor is failing... Or
Ignition control module is failing.
Does it happen when the engine i warm or at all times?
Yes=ignition switch on top the steering column is failing.
No=Profile ignition pickup sensor inside the distributor is failing... Or
Ignition control module is failing.
Does it happen when the engine i warm or at all times?
Thread Starter
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2nd Gear
Joined: Apr 2024
Posts: 2
Likes: 0
From: Pennsylvania
Just the Tach drops.
It's definitely not a single cylinder misfire.
The ignition module was just replaced for other symptoms. I was thinking about ignition primary, the truck has been sitting for a few years.
It's definitely not a single cylinder misfire.
The ignition module was just replaced for other symptoms. I was thinking about ignition primary, the truck has been sitting for a few years.
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