Higgins56
Well-known member
- Joined
- Jan 2, 2012
- Messages
- 193
- Reaction score
- 0
- Location
- Finland
- My Car
- 1971 Mach 1 Fastback now with 503 CID 4 bolt block with AFR Bullit heads , Edelbrock Performer RPM AirGap intake and ProSystems carburettor 1050.
4 sp Toploader with 9" Wavetrac rear.
Caltracs and shocks at the rear.
Hi,
I am about to get my 429 mach 1 back on the road after 14 years of rebuilding ( not me but the owners before ...)
I have owned the car now two years and this spring we rewamped the electronics to MSD street fire + Blaster coil and the MSD distributor.
The carburettor was changed to a brand new Holley Street avenger 870.
The engine has been run only for short bursts - max 5 min so far as the rebuilding is on its way still.
Now the electronics ( lights etc) were checked and the tacho was get running via the MSD adaptor box... BUT after again a short burst of running with now problems ( 10 gal fuel in the tank) the engine started chaking when pushing the gas pedal - I mean that the revs went to zero like the engine was getting too much fuel / could not breathe....
The fuel levels at the carb were checked and adjusted but no cure.
Always when starting from cold the engine starts running nicely and accepts more gas but within a minute it happens again - reves sunk to zero if trying to giver more gas / holding the foot on the pedal.
It is ompossible to get the revs up from the idle level now...
Interesting is that there is no black smoke or smell of fuel during this and the exhaust pipes are nice and clean.
All this happened the other day during a normal test run. No adjustments made to the carb....
Any clue from anybody where to check next / does anyone had similar symptoms during the rebuilding project... ?
The spark plugs were dry and a bit sooty and the gap ab 1 mm...
I am about to get my 429 mach 1 back on the road after 14 years of rebuilding ( not me but the owners before ...)
I have owned the car now two years and this spring we rewamped the electronics to MSD street fire + Blaster coil and the MSD distributor.
The carburettor was changed to a brand new Holley Street avenger 870.
The engine has been run only for short bursts - max 5 min so far as the rebuilding is on its way still.
Now the electronics ( lights etc) were checked and the tacho was get running via the MSD adaptor box... BUT after again a short burst of running with now problems ( 10 gal fuel in the tank) the engine started chaking when pushing the gas pedal - I mean that the revs went to zero like the engine was getting too much fuel / could not breathe....
The fuel levels at the carb were checked and adjusted but no cure.
Always when starting from cold the engine starts running nicely and accepts more gas but within a minute it happens again - reves sunk to zero if trying to giver more gas / holding the foot on the pedal.
It is ompossible to get the revs up from the idle level now...
Interesting is that there is no black smoke or smell of fuel during this and the exhaust pipes are nice and clean.
All this happened the other day during a normal test run. No adjustments made to the carb....
Any clue from anybody where to check next / does anyone had similar symptoms during the rebuilding project... ?
The spark plugs were dry and a bit sooty and the gap ab 1 mm...