5.4l swap done, but new motor wont start? video
09-22-2011, 10:32 AM
#21
1st Gear Member
Thread Starter
Join Date: May 2007
Location: Tampa, FL
Posts: 97
doesnt really make any sense... it should run absolutely fine with the stock tune installed, 4.6/5.4 are all the same, ones just bigger than the other, it should start/idle/everything just like a stock car.
where did you get the motor from?
did you install cams? anything else?
somethings deff rotten in Denmark here...
where did you get the motor from?
did you install cams? anything else?
somethings deff rotten in Denmark here...
09-22-2011, 10:34 AM
#22
1st Gear Member
Thread Starter
Join Date: May 2007
Location: Tampa, FL
Posts: 97
09-22-2011, 09:37 PM
#23
1st Gear Member
Join Date: Aug 2008
Location: Chicago
Posts: 120
i would check a wiring harness if i remember correctly some of the wiring connector changed wire locations on the sensor plugs.
That might be the problem your crank sensor could be plugged in but not reading correctly due to the sensor on the 5.4L. you will also need a tune or it will run like crap.
also i would check compression as you never know if they torqued the heads correctly.
That might be the problem your crank sensor could be plugged in but not reading correctly due to the sensor on the 5.4L. you will also need a tune or it will run like crap.
also i would check compression as you never know if they torqued the heads correctly.
09-22-2011, 09:49 PM
#25
i would check a wiring harness if i remember correctly some of the wiring connector changed wire locations on the sensor plugs.
That might be the problem your crank sensor could be plugged in but not reading correctly due to the sensor on the 5.4L. you will also need a tune or it will run like crap.
also i would check compression as you never know if they torqued the heads correctly.
That might be the problem your crank sensor could be plugged in but not reading correctly due to the sensor on the 5.4L. you will also need a tune or it will run like crap.
also i would check compression as you never know if they torqued the heads correctly.
09-24-2011, 04:30 PM
#26
1st Gear Member
Thread Starter
Join Date: May 2007
Location: Tampa, FL
Posts: 97
Im using same harness same sensors everything is exactly the same. Guess I will just have to call a mechanic over here. Sucks because I have made it this far by myself. Im going to put my 42# injectors in today change the fuel filter and add some fresh gas and see what happens. Guess I will finish putting on the exhaust too because the neighbors cant like the sound.
09-24-2011, 04:57 PM
#27
1st Gear Member
Join Date: Aug 2008
Location: Chicago
Posts: 120
I work for ford and know that you don't just go to a different engine and expect it to run correctly with out changing parameters in the ecu.
09-25-2011, 12:51 AM
#28
2nd Gear Member
Join Date: Oct 2005
Posts: 216
the 5.4l motor has different sensor and runs different then a 4.6l. there for will need a tune to run correctly when using the stock ecu.
I work for ford and know that you don't just go to a different engine and expect it to run correctly with out changing parameters in the ecu.
I work for ford and know that you don't just go to a different engine and expect it to run correctly with out changing parameters in the ecu.
10-16-2011, 01:03 AM
#29
1st Gear Member
Join Date: Jul 2008
Location: Ontario Canada
Posts: 101
I'd do a compression test to make sure the motors got good compression, then look into your crankshaft position sensor, check curcuits. Have you been working on cars long? Maybe just hire a mechanic.
Let us know
Let us know
Last edited by 03FASTGT; 10-16-2011 at 01:11 AM.
10-16-2011, 02:54 AM
#30
4th Gear Member
Join Date: May 2009
Location: DFW, TX
Posts: 1,925
the 5.4l motor has different sensor and runs different then a 4.6l. there for will need a tune to run correctly when using the stock ecu.
I work for ford and know that you don't just go to a different engine and expect it to run correctly with out changing parameters in the ecu.
I work for ford and know that you don't just go to a different engine and expect it to run correctly with out changing parameters in the ecu.
OP, try unplugging the MAF and starting it. Had a similar issue with an 89 Iroc-Z. Turned out that the MAF had gone out on it. Unplugging it should verify.