70 L-46 drivability issues

[Duke W.]

Re: 70 L-46 drivability issues

Day four of trouble shooting.



So far, I have replaced the coil, distributor cap & rotor, carb and carb to intake manifold gasket. Plug wires ohm out at 17k for the longest and 10k for the shortest.

TIA,
Mike

Have you replaced the aftermarket electronic switch with a plain old set of mechanical points?

Also your symptoms could be a broken breaker plate ground wire. You can test by disconnecting the VAC (to keep the breaker plate from moving) and running a jumper wire from the breaker plate through the cap window to a convenient point on the engine to ensure a good ground.

Search the TDB for a thread started by me on this issue in Dec/2012.

Duke

[Edward J.]

Re: 70 L-46 drivability issues

Have you replaced the aftermarket electronic switch with a plain old set of mechanical points?

Also your symptoms could be a broken breaker plate ground wire. You can test by disconnecting the VAC (to keep the breaker plate from moving) and running a jumper wire from the breaker plate through the cap window to a convenient point on the engine to ensure a good ground.

Search the TDB for a thread started by me on this issue in Dec/2012.

Duke

Duke somewhere he posted the car ran on ether when the problem is there.

[Mike F.]

Re: 70 L-46 drivability issues

Have you replaced the aftermarket electronic switch with a plain old set of mechanical points?

Also your symptoms could be a broken breaker plate ground wire. You can test by disconnecting the VAC (to keep the breaker plate from moving) and running a jumper wire from the breaker plate through the cap window to a convenient point on the engine to ensure a good ground.

Search the TDB for a thread started by me on this issue in Dec/2012.

Duke

At this point it's a carb issue. Seems like there is no fuel to the idle circuit. The accelerator pump will squirt fuel, the car will light off and run until that fuel charge is burned up (5-10 seconds) and then stalls. With starter fluid I can keep the car running continuously.

I'll be roaming around the Regional tomorrow. I have the empty parking spot between the Laguna Gray ZR-1 and the Marlboro Maroon LS-5.

[Terry M.]

Re: 70 L-46 drivability issues

Car wouldn't start this morning. Maybe next year.

It is raining anyway -- sometimes hard

[Mark E.]

Re: 70 L-46 drivability issues

At this point it's a carb issue.

Hah! I thought it was a fuel issue! See post #6. I love it when my guess is right. Which, according to my wife, isn't often.

Mike, Let us know what you finally discover as the root cause.

[Mike F.]

Re: 70 L-46 drivability issues

Hah! I thought it was a fuel issue! See post #6. I love it when my guess is right. Which, according to my wife, isn't often.

Mike, Let us know what you finally discover as the root cause.

I installed a service replacement carb that I have and it fired right up. I'll drive it for a few weeks to make sure there aren't any other issues and then open up the original carb.

[Tim G.]

Re: 70 L-46 drivability issues

I had a '69 L46 and the in line fuel filter was clogged up, I figured that out after changing the fuel pump. I believe the 1970 L46 has an in line fuel filter. You may want to check it for flow.

[Mark E.]

Re: 70 L-46 drivability issues

I had a '69 L46 and the in line fuel pump was clogged up, I figured that out after changing the fuel pump. I believe the 1970 L46 has an in line fuel pump. You may want to check it for flow.

In-line fuel pump? Do you mean fuel filter? If yes, the L46 uses a Q-Jet which has a filter in its inlet.

[Tim G.]

Re: 70 L-46 drivability issues

Mark, you are correct, fuel filter. I changed my post. Thank you for noting the error.

[Michael F.]

Re: 70 L-46 drivability issues

Mike, hope you got it fixed, by the way love a white 70, had a 454 coupe and later a L-46 coupe back in the day. Mike, pm me if you need any help as I come to Dallas every couple weeks, next time is weekend before veterans day. I came late to frisco event but it was after 4 pm and lot of nice cars and no rain.

Mike