check engine light but no code
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Senior User
Joined: Oct 2008
Posts: 244
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From: ON & AB, Canada
check engine light but no code
Truck runs weel and starts great, but the MIL (check engine light) comes on.
Here's what happens;
I glow the truck, crank the starter and it fires up nicely. It will run smooth for 20 - 25 secs, then the rpms pick up slightly, the MIL comes on and the engine runs kinda rough.
I read the codes, but there aren't any.
Any ideas?
Here's what happens;
I glow the truck, crank the starter and it fires up nicely. It will run smooth for 20 - 25 secs, then the rpms pick up slightly, the MIL comes on and the engine runs kinda rough.
I read the codes, but there aren't any.
Any ideas?
Senior User
Joined: Nov 2007
Posts: 337
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From: Mt. Airy MD
Mine does the same thing. I get the CEL when cold, the it high idles. Every now and then it will give me a code about exhaust backpresure(EBPV is unplugged). CEL goes out after 10-20 seconds, but even after getting warm the idle still goes up and down( can't see it on the tach but can hear it in the engine)
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
Your code reader may not be able to read diesel, most don't. It's been my experience that if the light is lit, there is a code. Maybe it is stored as a soft code...again the scanner may not be able to read it.
Senior User
Joined: Nov 2007
Posts: 337
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From: Mt. Airy MD
Thread Starter
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Senior User
Joined: Oct 2008
Posts: 244
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From: ON & AB, Canada
Inova (Equus) 3120 and a 1303.
Same result with both.
Garage around the corner from me will scan it tomorrow for $30.
Same result with both.
Garage around the corner from me will scan it tomorrow for $30.
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Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
Don't know about the 1303.
Some autozones can scan a PSD for free but it's a crap-shoot. Some do, some don't know how.
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Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
Autoenginuity all the way, I opted the high end model so I can fix all those "other" cars 
Very steep learning curve but well worth the effort.
BTW: I use a laptop but You don't need one with the bluetooth connector (Big $$$), you just gotta get the car close enough to it....500ft without obstructions and up to 100ft with obstructions.
Very steep learning curve but well worth the effort.
BTW: I use a laptop but You don't need one with the bluetooth connector (Big $$$), you just gotta get the car close enough to it....500ft without obstructions and up to 100ft with obstructions.
Senior User
Joined: Nov 2007
Posts: 337
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From: Mt. Airy MD
Try the scangauge. terminator engineering has them. I think $220 (don't really know, been to long) Reads codes, buzz test cylinder contribution, and displays all the sensors the pcm reads. and all this in a 2-1/8" gauge .
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cscott952
1987 - 1996 F150 & Larger F-Series Trucks
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Sep 10, 2016 06:34 AM
