Weak form the start
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New User
Joined: Apr 2003
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Weak form the start
Just did a head job on 90 4.9 F150 2wd E4OD w/ 216kmiles.
It runs and fairly well espcially once up and going but from a stop is weak. She used to be able to light the tires but not anymore.
Besides the head I cleaned the ACT and IAC, have also check all the sensors and ohms is with in spec (have not check EGR though). During reassembly I dropped a bolt down exhaust, could this have damaged the Cat, causing problem?
It runs and fairly well espcially once up and going but from a stop is weak. She used to be able to light the tires but not anymore.
Besides the head I cleaned the ACT and IAC, have also check all the sensors and ohms is with in spec (have not check EGR though). During reassembly I dropped a bolt down exhaust, could this have damaged the Cat, causing problem?
New User
Joined: Dec 2004
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check the base timing with the spout connector removed, are all the plug wires in the right place? it happens, if you get the right 2 reversed you wont feel a misfire.....
a bolt shouldnt damage the cat, 80% of the ford trucks i have pulled the cats off of are part pluged anyway.
a bolt shouldnt damage the cat, 80% of the ford trucks i have pulled the cats off of are part pluged anyway.
Junior User
Joined: Dec 2004
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Are you sure the bolt made it to the cat? Did you remove the bolt afterward? If the bolt fell in the exaust and got caught, and its big enough it could build up back pressure and in a sense choke the motor down at higher rpm's
Elder User
Joined: Sep 2004
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If you set the timing to 10BTDC with the SPOUT jumper in place, then the timing could be way, way retarded from where it should be. Retarded timing would have the kind of inpact on "get up and go" that you describe. You HAVE to remove the SPOUT jumper to set ignition timing, or both you and the computer will be trying to play with spark timing at the same time. The timing will be fixed with SPOUT removed -- you only need a basic "flash the light when you see spark" timing light to work with that.
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Thanks to shango I did deduce that I did set the timing improperly. Did inital check w/o SPOUT and timing was about 2-0* now at 11-9*, and she's back alive. Now just have to let my dad drive it and get his opinion (since it is his truck).
Thank you shango and fefarms for your imput on locating the problem, yall can't imagine how many people I asked about this and they had no idea.
Thank you shango and fefarms for your imput on locating the problem, yall can't imagine how many people I asked about this and they had no idea.
