1970 mach1 351c falls on its face when i hit accelerator.
07-20-2014, 01:58 PM
#11
Thread Starter
Join Date: Jul 2014
Location: Indiana
Posts: 14
Havent checked advance yet but the mechanic that looked at it told me it was within specs. He was going to advance timing a little but the distributer was locked in tight and he said he was affraid of breaking it. (I told him he should have tried... that way I would have had no choice but to get a better one...lol).
07-20-2014, 02:45 PM
#12
3rd Gear Member
Join Date: Apr 2011
Location: Wisconsin
Posts: 917
Not sure if being told"its within specs" would make me feel better. It's easy to check with a timing light and a vacuum pump. I'd start with a vacuum gauge hooked in place of the vacuum input on the distributor to make sure the engine is pulling the correct vacuum at idle and running. Then put a vacuum pump hooked to the distributor while running a check to see that the timing advances when you pull a vacuum. (plug the vac line to the the distributor)
I like to do this at idle, then check the timing when running the RPMs up to 3,000 or so with the vac line still disconnected (and plugged) This will tell you if the centrifical advance is working.
I like to do this at idle, then check the timing when running the RPMs up to 3,000 or so with the vac line still disconnected (and plugged) This will tell you if the centrifical advance is working.
07-20-2014, 09:02 PM
#13
4th Gear Member
Join Date: Aug 2007
Location: Stroudsburg, PA
Posts: 1,148
I'm getting the impression this car is new to you or has been sitting for a while. If there is no black smoke when it falls over then most likely you are having a lean condition rather than rich. Could be fuel filter is clogged. Step one for me is a complete tune up, plugs, wires, cap, rotor, condensor, fuel filter, air filter. If it has been sitting then get the old gas out and put in some fresh fuel. lLso, check your electrical connections/grounds to make sure they are clean and not oxidized or corroded. With that done you'll at least have a good starting point baseline to work off of to isolate your issue. Right now you may have multiple problems. Soak down the distributor bolt & shaft and the plugs if needed with PB Blaster numerous times over a few days to be sure they come free.
07-21-2014, 08:03 AM
#14
Thread Starter
Join Date: Jul 2014
Location: Indiana
Posts: 14
Not sure if being told"its within specs" would make me feel better. It's easy to check with a timing light and a vacuum pump. I'd start with a vacuum gauge hooked in place of the vacuum input on the distributor to make sure the engine is pulling the correct vacuum at idle and running. Then put a vacuum pump hooked to the distributor while running a check to see that the timing advances when you pull a vacuum. (plug the vac line to the the distributor)
I like to do this at idle, then check the timing when running the RPMs up to 3,000 or so with the vac line still disconnected (and plugged) This will tell you if the centrifical advance is working.
I like to do this at idle, then check the timing when running the RPMs up to 3,000 or so with the vac line still disconnected (and plugged) This will tell you if the centrifical advance is working.
07-21-2014, 08:08 AM
#15
Thread Starter
Join Date: Jul 2014
Location: Indiana
Posts: 14
I'm getting the impression this car is new to you or has been sitting for a while. If there is no black smoke when it falls over then most likely you are having a lean condition rather than rich. Could be fuel filter is clogged. Step one for me is a complete tune up, plugs, wires, cap, rotor, condensor, fuel filter, air filter. If it has been sitting then get the old gas out and put in some fresh fuel. lLso, check your electrical connections/grounds to make sure they are clean and not oxidized or corroded. With that done you'll at least have a good starting point baseline to work off of to isolate your issue. Right now you may have multiple problems. Soak down the distributor bolt & shaft and the plugs if needed with PB Blaster numerous times over a few days to be sure they come free.
You are correct. I had a 69 mach about 10 years ago but the engine was newer so i didnt have to do anything.
The 70 i just bought has mostly original engine parts, but im changing that.
Thanks for the starting points.
07-24-2014, 12:06 AM
#16
Thread Starter
Join Date: Jul 2014
Location: Indiana
Posts: 14
I'm getting the impression this car is new to you or has been sitting for a while. If there is no black smoke when it falls over then most likely you are having a lean condition rather than rich. Could be fuel filter is clogged. Step one for me is a complete tune up, plugs, wires, cap, rotor, condensor, fuel filter, air filter. If it has been sitting then get the old gas out and put in some fresh fuel. lLso, check your electrical connections/grounds to make sure they are clean and not oxidized or corroded. With that done you'll at least have a good starting point baseline to work off of to isolate your issue. Right now you may have multiple problems. Soak down the distributor bolt & shaft and the plugs if needed with PB Blaster numerous times over a few days to be sure they come free.
We took it apart and some of the guts were missing. Im surprised it even ran. Decided to just throw a new one in rather than rebuild it. The carb was a little rich also, so those two things together were the cause of the sputtering and falling on its face when i hit the gas.
I'll post full results when we get the new distributor in.
Thanks a bunch to everyone for all your help. Im glad to have your help.
07-25-2014, 08:39 PM
#19
Thread Starter
Join Date: Jul 2014
Location: Indiana
Posts: 14
Well...
Got the new distributor on.... tried to set the timing (way advanced), but found that the engine still sputtering and backfiring out of the carb as we try to adjust.
Lots of slop in the timing chain so its comming out! Gonna put a new one in and hopefully we can get this pig oinking.
Got the new distributor on.... tried to set the timing (way advanced), but found that the engine still sputtering and backfiring out of the carb as we try to adjust.
Lots of slop in the timing chain so its comming out! Gonna put a new one in and hopefully we can get this pig oinking.
07-25-2014, 08:47 PM
#20
Thread Starter
Join Date: Jul 2014
Location: Indiana
Posts: 14
On a side note ( you guys will love this)...
I started messing with the dash, taking panels and bezels off to see what im working with because im planning on putting a stereo in later.
I found lots of wires not connected, plugs not connected, etc. I even found a bunch of loose wires not even connected to anything. To my surprise, there was 2 under-dash lights tucked up under there not hooked up. I didnt even know this car had them! Bonus! Now i just need to figure out what type bulb it takes... the assembly is rectangular. It looks like a fuse style bulb fits in it. (My wiring diagram book cant get here soon enough!)
I also found a joint under there... its like a time capsule... i love it.
I started messing with the dash, taking panels and bezels off to see what im working with because im planning on putting a stereo in later.
I found lots of wires not connected, plugs not connected, etc. I even found a bunch of loose wires not even connected to anything. To my surprise, there was 2 under-dash lights tucked up under there not hooked up. I didnt even know this car had them! Bonus! Now i just need to figure out what type bulb it takes... the assembly is rectangular. It looks like a fuse style bulb fits in it. (My wiring diagram book cant get here soon enough!)
I also found a joint under there... its like a time capsule... i love it.
