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Hello, welcome to JA, my name is XXXXX XXXXX try to help... Couple questions, any smoke when it cuts out? do you have cruiz control, and has it ever had the miss in cruiz? does it ever miss when not moving and just throttling up? sounds like you have ET or a scanner? Also, please include engine ser# XXXXX reply...
no smoke when it cuts out,never tried it in cruise,does cut out moving or not,original complaint was that the truck would barely go more than 8 miles an hour then it would just take off like a rocket, I test drove it. it was never that bad but i could feel a miss mostly upon take off then engine would clear up. I've since given the truck back for local deliveries only until it gets worse, so I do not have engine serial# XXXXX
Hello mechanic mike, Thanks Heath for the input... on a intermitten miss like you have explained that only happens sometimes , I would not go changing the heui dirty oil / diluted oil would be causing problems more constant, and if the Heui was pumping metal you would be parked..and i would not condem any Heui with out plugging into it and checking accuation pressures, and what the ECM is seeing.. any ways, with out the ser# XXXXX had to use a a typical ser# XXXXX here is your trouble list for intermitten cut out... the reason I asked if it does it in cruiz is because if it doesnt, then you will want to focus on the throttle position sensor...let me know
Hello... Yes sir you can!!! Just reply back when you are ready...
Talk with you then,
Ok,your ser # XXXXX the same list I gave so lets start with a couple checks., no check engine lights correct? this has brand new fuel filters?. . when sitting at a idle... no problems correct?
Full throttle nuetral with foot pedel does it miss or cut out??
If you , turn on the cruiz switch and with out the pedal, use the accel switch to throttle up any problems??
Do you have a reader or Cat ET? or access to it if so the things we need to check is fuel position to fuel rate.. and quite a few other things..
Ok I am really leaning towards the TPS now if it doesnt cut out with the cruiz accel, but does with the pedal... so if you were to take it for a drive and use the accel switch for a throttle, I wonder if you could get top speed with out issue.. Check the plug real well at the pedel, also make sure its comming all the way up..( no dirt jammed under the back of it)
any ways lets go the the next step see if you can do the following with your prolink.. i am not familar with prolink on cat.. because I have ET..try this..........
Monitor the fuel position, the rated fuel limit and the FRC fuel limit.
While the vehicle is operating under full load, the parameters should meet the following conditions:
Let me know..
Ok .. so sounds like we may have corrected one issue of a few issues with the TPS.. your fuel rate is higher than the frc so the next step is the following. you already checked the rate and pos..
read 4 and do 5 also make SURE you are not getting a code when the miss is happening..
If the fuel position is equal to the rated fuel limit and the fuel position is less than the FRC fuel limit, the electronics are operating correctly.
When the engine is off, the boost pressure should be 0 kPa (0 psi).
Check the above first...then if its OK and your prolink will do a injector cut out test check that...
I will be off work and home in about 2 hrs...