Truck cuts off when we put it in reverse or drive - The 1947 - Present Chevrolet & GMC Truck Message Board Network

rwmoore · 07-17-2015, 11:47 PM

I just bought my son a '77 C20 with the 292 straight 6. We put new plugs, wires, pcv valve, and rebuilt the carb. It will start and idle now, but when we put it in reverse or drive it cuts off.The carb is the Rochester monojet me #17057008. This carb has an electric choke and throttle solenoid. Both have male electrical connectors that have no wires going to them. I am thinking I could run a wire from either the starter or the ignition coil hot side to these connectors, but am not sure? Can someone help me out here?

Dead Parrot · 07-18-2015, 08:10 AM

First thought I had was the neutral safety switch is wired to the ignition circuit rather then the start circuit.

Titomars · 07-18-2015, 11:11 AM

The choke is easy to wire.
You need an ignition hot lead to the choke coil and the other terminal grounds.
The throttle solenoid is either an anti dieseling solenoid or an idle speed solenoid. To find out which apply 12 volts to it and see which way it moves. If the solenoid plunger moves away from the throttle arm it is an anti dieseling solenoid. If it moves towards the throttle arm is idle speed related. Now if it is what I think it is an anti dieseling solenoid than you would use another ignition hot lead to it. You can use the same lead that the choke would use. Also if it is an anti dieseling solenoid to adjust it, with the key off it should contact and hold open the throttle lever about a 1/8 inch off full closed. If it is idle speed related they were generally for A/C and you would use a compressor feed to wire to the solenoid. It was designed to step up the idle approx. 200 RPM when the A/C was engaged to maintain a good idle quality.
the dying in gear is most likely a tune problem possibly the idle is too low, or the idle mixture is too lean, or the timing is off, or a vacuum leak.

**Corts60** · 07-19-2015, 12:40 AM

Agree with above. Also, putting the vacuum advance on the distributor to manifold vacuum instead of ported vacuum would help keep the timing advanced at idle.

rwmoore · 07-19-2015, 10:21 PM

I believe it is an anti dieseling solenoid, but will get it wired up to make sure. This truck has no A/c. I think I need to invest in a timing light. I;m just not sure why this thing would even have an electric choke since there is a manual choke with cable installed in the dash and it looks factory???

07-18-2015, 08:10 AM	#2
Dead Parrot Registered User Join Date: Aug 2012 Location: Oklahoma City, OK Posts: 2,620	Re: Truck cuts off when we put it in reverse or drive First thought I had was the neutral safety switch is wired to the ignition circuit rather then the start circuit.

07-18-2015, 11:11 AM	#3
Titomars Registered User Join Date: Feb 2015 Location: Santa Rosa, Ca. Posts: 539	Re: Truck cuts off when we put it in reverse or drive The choke is easy to wire. You need an ignition hot lead to the choke coil and the other terminal grounds. The throttle solenoid is either an anti dieseling solenoid or an idle speed solenoid. To find out which apply 12 volts to it and see which way it moves. If the solenoid plunger moves away from the throttle arm it is an anti dieseling solenoid. If it moves towards the throttle arm is idle speed related. Now if it is what I think it is an anti dieseling solenoid than you would use another ignition hot lead to it. You can use the same lead that the choke would use. Also if it is an anti dieseling solenoid to adjust it, with the key off it should contact and hold open the throttle lever about a 1/8 inch off full closed. If it is idle speed related they were generally for A/C and you would use a compressor feed to wire to the solenoid. It was designed to step up the idle approx. 200 RPM when the A/C was engaged to maintain a good idle quality. the dying in gear is most likely a tune problem possibly the idle is too low, or the idle mixture is too lean, or the timing is off, or a vacuum leak. __________________ 1977 Chevrolet C/10 Silverado. Step-Side, Factory 454, TH400, 3.73 Posi 12 Bolt. 1975 Chevrolet El Camino. 350, TH400, 3.08 Posi 10 Bolt. Last edited by Titomars; 07-18-2015 at 11:17 AM.

07-19-2015, 12:40 AM	#4
Corts60 Just here to tinker Join Date: Jun 2008 Location: Holland, MI Posts: 3,697	Re: Truck cuts off when we put it in reverse or drive Agree with above. Also, putting the vacuum advance on the distributor to manifold vacuum instead of ported vacuum would help keep the timing advanced at idle. __________________ 78 C10 SWB Diesel #1 (wrecked)http://67-72chevytrucks.com/vboard/s...1978+silverado 78 C10 SWB Diesel #2 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=650751 60 GMC Suburban (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=445526 60 GMC 1000 (sold)http://67-72chevytrucks.com/vboard/showthread.php?t=298235 67 GMC 1500 (sold) http://67-72chevytrucks.com/vboard/s...d.php?t=803695 73 Chevy C20(Daily)http://67-72chevytrucks.com/vboard/s...d.php?t=852767 86 Suburban(summer unit) http://67-72chevytrucks.com/vboard/s...d.php?t=810697 88 Suburban 4x4(sold)

07-19-2015, 10:21 PM	#5
rwmoore Registered User Join Date: Jul 2015 Location: Midlothian, Virginia Posts: 3	Re: Truck cuts off when we put it in reverse or drive I believe it is an anti dieseling solenoid, but will get it wired up to make sure. This truck has no A/c. I think I need to invest in a timing light. I;m just not sure why this thing would even have an electric choke since there is a manual choke with cable installed in the dash and it looks factory???

07-17-2015, 11:47 PM	#1
rwmoore Registered User Join Date: Jul 2015 Location: Midlothian, Virginia Posts: 3	Truck cuts off when we put it in reverse or drive I just bought my son a '77 C20 with the 292 straight 6. We put new plugs, wires, pcv valve, and rebuilt the carb. It will start and idle now, but when we put it in reverse or drive it cuts off.The carb is the Rochester monojet me #17057008. This carb has an electric choke and throttle solenoid. Both have male electrical connectors that have no wires going to them. I am thinking I could run a wire from either the starter or the ignition coil hot side to these connectors, but am not sure? Can someone help me out here? Last edited by rwmoore; 07-18-2015 at 12:04 AM.



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