Topic: cteng's 460 question thread...Small Successes

[CTENG in KS]

It has backfired several times.  It is a motorcraft 4150...I looked up the diagrams and info, it doesn't appear to have a power valve although it was originally manufactured by holley.  It has an internal piston-style accelerator pump and that looks to be it besides the main fuel metering circuit.

edit:  also, if a power valve goes bad it should create a constant rich mixture...that doesn't seem to be the case, I seem to be leaning way out when I step on it.

[CTENG in KS [OP]]

Well, I pulled the vacuum advance and capped the line.  I couldn't even get out of the parking space before she was wheezing back out the carb.  Looks like it is indeed a timing problem and I have to get the dist. moving again.  I am hoping that since I was trying to turn it with the engine hot, if I let it cool the dist. shaft will shrink a little and let me turn it.  I am not optimistic.

[CTENG in KS [OP]]

Update:

I managed to adjust the timing.  I found that there is a range of about 1/2 inch of rotation that the engine will run in.  Outside that range on one side it pukes out the carb, the other it makes like a cannon from the tailpipe.  I found the one spot seemingly, where it runs and I can push the gas in third without the POOF.  Only issue now is I am losing throttle response from a stop.  You push the gas and have to wait for the engine to catch up.

[fordh8r]

Update:

I managed to adjust the timing.  I found that there is a range of about 1/2 inch of rotation that the engine will run in.  Outside that range on one side it pukes out the carb, the other it makes like a cannon from the tailpipe.  I found the one spot seemingly, where it runs and I can push the gas in third without the POOF.  Only issue now is I am losing throttle response from a stop.  You push the gas and have to wait for the engine to catch up.

No timing light?    Sounds like it's retarded by what you said. 

[CTENG in KS [OP]]

Timing light does me NO good.  I try to get it to stock 12 degrees and it is running so horrifically bad and coughing out the carb that I can't bear to listen to it.

[79coyotefrg]

Aj,  as bad  as  this is gonna sound , im thinking  timing chain stretch 

[CTENG in KS [OP]]

I didn't really think about that, but it certainly would be possible.  It seems to be OK for driving around right now.  I am gonna take it easy on her for now.  She needs some engine work it would seem...the heads need to come off as well.

[79coyotefrg]

[CTENG in KS [OP]]

yeah, that's what I said. 

[KDXSR5]

So my timing guess may be correct?

I pulled a 350 from a van a few months ago... it was no fun at all. I can't imagine pulling a big block out of a van, thats going to suck! Even worse will be trying to get it back into the van. Or are you going to attempt the heads and timing chain with the engine still in the van?

[CTENG in KS [OP]]

Who knows...I might just attempt the sell it and buy something new conversion.

[fordh8r]

Heck if you're gonna pull the heads and end up replacing the timing chain you might as well rebuild it all and forget about it.  Not much left from there once you get the heads off. 

[79coyotefrg]

yea AJ, youve done so much work on this thing already,  it wouldnt take you long,  i would  pull the front clip off and BOOM  access

besides  its so unique

[Duffil]

not to mention, while its out, Painless wiring EFI conversion...better power, mileage, etc.

[brainlessfool]

is there a wire that you have to ground on this year to get the right base timimg? or unhook? by the dist?

and I do belive that the A/C vents are controles with vac.

and have you checked for pump shot in the carb? to see if the acc. pump works?

[CTENG in KS [OP]]

If I have the cover off and the air cleaner off and I am lookin at the top of the carb, I push the gas pedal and misy vapor drifts out the top of the carb.  I took that to mean the pump was working.

[brainlessfool]

If I have the cover off and the air cleaner off and I am lookin at the top of the carb, I push the gas pedal and misy vapor drifts out the top of the carb.  I took that to mean the pump was working.

if the eng. is worm, it may not. bad way to check anyway. ya need to look  


not running tho.

[CTENG in KS [OP]]

No engine was off and fairly cool at the time.