5.4 L Starting Problems
FTE Leadership Emeritus
Joined: Sep 2000
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From: Stephensville WI
CPS sounds very plausible. The fact that you sprayed starter fluid into the air cleaner while cranking and didn't get the truck to at least run briefly would indicate you have no spark. Without the CPS< the PCM won't be ab;e to tell the COPs when to fire.
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New User
Joined: Jun 2008
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Thanks again,
There are two sensors-
one is the Camshaft Position Sensor (CMP)
other is Crankshaft Position Sensor (CKP)
Cam sensor looks easier to get to so starting with that one (after I check the under dash relays, thanks Tom)
Thank you
John
There are two sensors-
one is the Camshaft Position Sensor (CMP)
other is Crankshaft Position Sensor (CKP)
Cam sensor looks easier to get to so starting with that one (after I check the under dash relays, thanks Tom)
Thank you
John
i ain't rite
Joined: Mar 2005
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From: Marlboro Mental Hospital.
to access the relays under the dash, pull the radio.
Junior User
Joined: Jun 2008
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From: Ft Collins Co
I agree check your intake when i was putting in my cold air i was messing with the sensors on the intake and disconnected one. I started it and it ran great for a few mins and then died plugged it back in and it started right up. Also my coils have started to go out and they are going out one at a time. Even with two or more out my truck still ran or it could be the solenoid on the starter.
Junior User
Joined: Jun 2008
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From: Ft Collins Co
Also when my first coil went out i talked to a lot of people and everyone said something different but they said if it was a miss fire the check engine light would come on. But when it came down to it was a miss fire and the check engine never came on and i also had it plugged and scanned. So what i am saying is just because the check engine light does not come on does not mean you are getting spark or something else.
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i ain't rite
Joined: Mar 2005
Posts: 65,607
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From: Marlboro Mental Hospital.
a coil misfire will not always trigger a misfire code.
if it is a once in a while misfire, it will not throw a code. most of the time it will only throw a code when the coil dies.
if it is a once in a while misfire, it will not throw a code. most of the time it will only throw a code when the coil dies.
Posting Guru
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A misfire is always detected but also catagorized. So it can be seen or considered as to its relivance. Although it does throw a code it cycles out of the computers current reading but can be seen, and refferred to a a ghost, or a shadow. Meening just that . Old problem but sytem corrected.
Sometimes that very circumstance can lead a tech to a possible fault or cause. If a coil is going weak, The computer will offset the injector, to still attempt to get a good or close to good cylinder burn.
That is why the old cars, (points, carbs ) ect would leave you stranded. These new cars may still leave you strnded but mostly help you at least get home, although with a check engine light, be it yellow or red
FTE Leadership Emeritus
Joined: Sep 2000
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From: Stephensville WI
A misfire in these trucks will cause a PENDING CODE. You usually won't get an actual code or a CEL from a misfire caused by a bad COP, bad boot or a bad plug.
This is why you need to use a scanner that can pull the pending error codes.
This is why you need to use a scanner that can pull the pending error codes.
i ain't rite
Joined: Mar 2005
Posts: 65,607
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From: Marlboro Mental Hospital.
and like i said, a occasional coil misfire will not always throw a readable code.
the coil has to damn near fail before it will throw a CEL
code.
i can't tell you how many times i have had to wait for a coil to get worse before i can change it, because it will not throw a readable code, but i know i have one going bad because of an occasional misfire.
the coil has to damn near fail before it will throw a CEL
code.
i can't tell you how many times i have had to wait for a coil to get worse before i can change it, because it will not throw a readable code, but i know i have one going bad because of an occasional misfire.
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From: Ft Collins Co
I would think so but when my coil goes out it never throws a code I had to drive from ft collins to durango thats about 350 miles running on 7 cylinder and i never got a code and it was running bad.