need help bad guys
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New User
Joined: Jun 2007
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From: lexington , sc
need help bad guys
first the background info , is an 84 f150 4wheel drive with 300 six
i had bad exhaust leak due to warped manifold . picked up used manifolds this morning and replaced both intake and exhaust as one unit . replacement was obviously from different year as my exhaust doesnt quite reach and there is no port for what i believe is an O2 sensor in pipe on bottom of manifold .
now truck will not crank . will turn over and crank if sprayed with starting fluid (running very rough)but wont even attempt to idle once i let off accelerator . loosened gas line to confirm do have gas . do suspect vacuum advance may not be any good but didnt think it would keep from cranking . any way to eliminate said sensor ? tried unplugging it but didnt make a difference . any help would be greatly appreciated as this is my daily driver and im down at moment
i had bad exhaust leak due to warped manifold . picked up used manifolds this morning and replaced both intake and exhaust as one unit . replacement was obviously from different year as my exhaust doesnt quite reach and there is no port for what i believe is an O2 sensor in pipe on bottom of manifold .
now truck will not crank . will turn over and crank if sprayed with starting fluid (running very rough)but wont even attempt to idle once i let off accelerator . loosened gas line to confirm do have gas . do suspect vacuum advance may not be any good but didnt think it would keep from cranking . any way to eliminate said sensor ? tried unplugging it but didnt make a difference . any help would be greatly appreciated as this is my daily driver and im down at moment
Posting Guru
Joined: Nov 2004
Posts: 2,155
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From: sunny fla sometimes windy
Nope just get a bung drill a hole in the stock location or close to it but in a easier accesible spot and weld it in!! You could try an O2 sensor eliminator but you will get
crappy mileage unless you constantly fiddle with it.
.http://www.hackaday.com/2006/11/14/o2-sensor-simulator/
crappy mileage unless you constantly fiddle with it.
.http://www.hackaday.com/2006/11/14/o2-sensor-simulator/
Thread Starter
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New User
Joined: Jun 2007
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From: lexington , sc
was wondering about vacuum leak myself after reading over a few older posts . am gonna start there after taking girlfriend to work but any other suggestions of what i need to look for people ? thanks for everyones help so far
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Joined: Oct 2007
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Before you do anything, do a compression check... The same thing happened to me, truck was running rough and wouldnt idle no matter what I did. I went through and replaced everything (carb, ignition, bla bla bla).... Then someone from this site told me to check the compression.... low and behold 9, 9, 7, 10, 10, 10....
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New User
Joined: Jun 2007
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From: lexington , sc
oscar you and ube were dead on it . did tighten to spec and in sequence but i guess manifold wasnt quite true as went back to what had changed . had major air coming in on manifold .had to really torque bolts down to clear up air leak . still have slight pull in center but dont want to strip out bolt holes . shes idling now but have got to get exhaust right before driving . planning on checking timing tomorrow hopefully
thanks for help guys !
thanks for help guys !
