Ignition timing jumping around
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3rd Gear
Joined: May 2022
Posts: 3
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Ignition timing jumping around
Howdy
Ive had this problem since last week. If I start the truck (‘94, 4.9 m5od 4x4) from cold, it starts VERY quickly, much quicker than it ever has. It seems to run fine, if not a little lean. If I turn the engine off and start it again, it takes more cranks and then sputters and I get terrible acceleration. If I cut the engine off and then wait an hour, it’s fine again.
I changed the ignition control module and that seemed to fix it for a day, but now it’s happening consistently.
I guess I should get a code reader, but does this situation sound familiar to anyone?
Ive had this problem since last week. If I start the truck (‘94, 4.9 m5od 4x4) from cold, it starts VERY quickly, much quicker than it ever has. It seems to run fine, if not a little lean. If I turn the engine off and start it again, it takes more cranks and then sputters and I get terrible acceleration. If I cut the engine off and then wait an hour, it’s fine again.
I changed the ignition control module and that seemed to fix it for a day, but now it’s happening consistently.
I guess I should get a code reader, but does this situation sound familiar to anyone?
Lead Driver
Joined: Jun 2021
Posts: 5,219
Likes: 804
Howdy
Ive had this problem since last week. If I start the truck (‘94, 4.9 m5od 4x4) from cold, it starts VERY quickly, much quicker than it ever has. It seems to run fine, if not a little lean. If I turn the engine off and start it again, it takes more cranks and then sputters and I get terrible acceleration. If I cut the engine off and then wait an hour, it’s fine again.
I changed the ignition control module and that seemed to fix it for a day, but now it’s happening consistently.
I guess I should get a code reader, but does this situation sound familiar to anyone?
Ive had this problem since last week. If I start the truck (‘94, 4.9 m5od 4x4) from cold, it starts VERY quickly, much quicker than it ever has. It seems to run fine, if not a little lean. If I turn the engine off and start it again, it takes more cranks and then sputters and I get terrible acceleration. If I cut the engine off and then wait an hour, it’s fine again.
I changed the ignition control module and that seemed to fix it for a day, but now it’s happening consistently.
I guess I should get a code reader, but does this situation sound familiar to anyone?
Thread Starter
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3rd Gear
Joined: May 2022
Posts: 3
Likes: 0
While I’m driving I can’t notice any change in timing. The change happens when I turn the engine off and on again. Then it’s consistently rough, unless I turn it off and let it sit an hour
Lead Driver
Joined: Oct 2016
Posts: 6,185
Likes: 633
From: Houston/Sugar Land
If you would like to run diagnostic codes here is how to do it. A paper clip can serve as a jumper. Only run the key on engine off test. KOEO. You will also need to depress the clutch the entire test to get your codes.
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sasquatch999
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
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Feb 25, 2008 12:04 AM
