| 0nebadbug |
Wed Aug 08, 2012 7:50 am |
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A few weeks ago my son swapped out his turbo motor in his '66 (blew it up). for the 40 horse that we running on our '57 projects chassis. Before swapping it over to his 66 we had no problems what so ever... after the swap back to his '66 now we have a slew of problems that we can't seem to nail down...
At first right after the swap It fired right up and ran just fine so he took a quick drive for the usual country mile and all seemed fine.
A couple hours later he gave it a quick wash to get all of the dust off from sitting and he ran it down to the gas station and filled up the tank and on the way back it started backfiring like crazy and was losing power on 3rd and wouldn't even push the car in 4th and he struggled to get much past 35mph and limped it back home
As soon as he got back we immediately pulled out the timing light and re-timed it and popped the dist cover thinking maybe something got wet from when he washed it maybe and since we had it open we cleaned up the points a bit and reset the gap... Fired it back up and it was till doing the same thing. But we noticed the smell of fuel, like it was running lean so we fiddled with the mixture screw and seemed tomake no difference. it would idle but as so soon as you hit 3rd backfire city and barely no power...
So we thought maybe the old carb was tired as we know the butterfly seal has leaked a bit of gas for the last year or two. So we decided to just order a brand spanking new one as well as ordered a new distributor as well, just in case.
So we got the new carb and dist yesterday and bolted them on...
Crank, crank crank... no fire... so we check for spark... sparks are nice and strong on all cylinders... then checked for fuel... no fuel... so we pulled off the fuel line from the pump to see if maybe it had a blockage maybe but none comes pouring out just as it should & clean as well...
So we thought maybe fuel pump... grabbed the spare one we have and swapped it out and still no fuel... so then we grabbed the electric fuel pump off the turbo and it pushes just fine, hooked it up to the new pict28 carb. A couple cranks and it fired right up...
Now that its getting fuel we can't get it to idle... it will run at anything over 1/4 throttle and we got the timing set to a point where it should be able to idle but as soon as you get off the gas it just simply coughs a few times and dies as it loses rpm.
Messed with the trim screw and throttle adjuster screw and seems to make no difference.
It has no smell of gas like its flooding running the electric fuel pump but it's just driving us bonkers seeing as we've never had an issue with this engine prior to swapping it back to the '66
Any have an y idea of something else we might be missing to check here?
..We're baffled.. |
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| slalombuggy |
Wed Aug 08, 2012 9:46 am |
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Did you check your valve adjustment?
Water in fuel?
Bad/Wrong Fuel (hi octane hard to burn in low comp motors)
brad |
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| 0nebadbug |
Wed Aug 08, 2012 10:39 am |
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slalombuggy wrote: Did you check your valve adjustment?
Water in fuel?
Bad/Wrong Fuel (hi octane hard to burn in low comp motors)
brad
Yeah checked and adjusted valves too just before we ordered the new carb and dist... And checked them again this morning and they are still fine at .006
Just running regular, 83 octane, thought maybe bad fuel but same gas we run in all of our cars, think they would be acting up in some manner too but they aren't..
We actually got it running just a bit ago. We had to remove the spring from the throttle adjuster screw just to hold the butterfly open enough just to make it hold low idle. Timing is dead on (we have it set maybe +2' TDC) anything below and it sputters at idle and dies...
Took it out for a short ride and the original problem still exists though... after 2 gear she starts backfiring and just no power and maxes about 30mph and that's it...
Thought it might be a vacuum leak maybe on the manifold somewhere, so we just checked them too and all nuts are tight, it just had all new manifold gaskets and I know it has no hidden rot holes in as we just stripped and painted it for the '57 project and it was running and driving without any problems at all...
The throttle screw thing is for some reason throwing up a red flag for me but I don't know what else to check... |
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