Truck dies when in gear - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Dino25Mumin · 03-02-2016, 09:16 PM

Okay I have a 68 stepside with a 350 with a mild cam and a 700r4. My problem is when I put it in gear (drive or reverse) and try to accelerate it dies, but when it's in park or neutral it revs up perfectly fine and everything. but when I shift it into reverse or drive it'll idle perfectly fine, however as soon as I attempt to accelerate it turns off.
Anyone know what could be causing it?

geezer#99 · 03-02-2016, 10:14 PM

Lack of initial timing and/or inadequate accelerator pump shot.

67chevy_hotrod · 03-03-2016, 01:43 AM

I second that! Make sure your timing is dialed in. Also what carb? What does it idle at in park?

Boyd67 · 03-03-2016, 10:24 PM

I remember my dad's chevelle doing the same thing. I asked my dad about it because he messes with 700r4's and his chevelle was doing the same thing. He said the guy who built the transmission had something backwards in the transmission. He isn't sure what it was but the guy swapped around and it run fine ever since.

Dino25Mumin · 03-03-2016, 10:27 PM

Quote:

Originally Posted by 67chevy_hotrod

I second that! Make sure your timing is dialed in. Also what carb? What does it idle at in park?

I had someone come out and do the timing and I'm running a edelbrock 1406.

Could loose valve springs be a problem as well?
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1955 mancave · 03-03-2016, 10:31 PM

if your converter is bad that will cause it to die

Boyd67 · 03-03-2016, 11:21 PM

Quote:

Originally Posted by 1955 mancave

if your converter is bad that will cause it to die

My dad and I talked about that as a possibility too. I wouldn't think it was engine related if it's fine in park and neutral.

Dino25Mumin · 03-03-2016, 11:23 PM

Quote:

Originally Posted by Boyd67

My dad and I talked about that as a possibility too. I wouldn't think it was engine related if it's fine in park and neutral.

That's what confused me so much.
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2manycars2littletime · 03-03-2016, 11:24 PM

Lock-up torque converter not disengaging?

geezer#99 · 03-03-2016, 11:54 PM

If you suspect the tranny or lockup just 'hot brake' it!
Bring the rpm's up slightly (about 1000 rpm) with your foot on the brake and slip it into gear. Feather the throttle with the brake on to keep it running. Then slowly decrease the rpm so it will idle in gear. If it keeps running it's not tranny related. If it dies it's timing related.

Dino25Mumin · 03-03-2016, 11:56 PM

Quote:

Originally Posted by geezer#99

If you suspect the tranny or lockup just 'hot brake' it!
Bring the rpm's up slightly (about 1000 rpm) with your foot on the brake and slip it into gear. Feather the throttle with the brake on to keep it running. Then slowly decrease the rpm so it will idle in gear. If it keeps running it's not tranny related. If it dies it's timing related.

I'll have to try that! Thank you
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03-02-2016, 09:16 PM	#1
Dino25Mumin Registered User Join Date: Nov 2014 Location: Glendale, AZ Posts: 8	Truck dies when in gear Okay I have a 68 stepside with a 350 with a mild cam and a 700r4. My problem is when I put it in gear (drive or reverse) and try to accelerate it dies, but when it's in park or neutral it revs up perfectly fine and everything. but when I shift it into reverse or drive it'll idle perfectly fine, however as soon as I attempt to accelerate it turns off. Anyone know what could be causing it?

03-02-2016, 10:14 PM	#2
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,733	Re: Truck dies when in gear Lack of initial timing and/or inadequate accelerator pump shot.

03-03-2016, 01:43 AM	#3
67chevy_hotrod Registered User Join Date: Jun 2014 Location: Lake Tapps Washington Posts: 386	Re: Truck dies when in gear I second that! Make sure your timing is dialed in. Also what carb? What does it idle at in park? __________________ 1967 Chevy CST 10 1969 Chevy C/20 Longhorn 1969 K10 Suburban 1972 Chevy Cheyenne Super 10 turned K30 (sold)

03-03-2016, 10:24 PM	#4
Boyd67 Registered User Join Date: Feb 2016 Location: China Grove, NC Posts: 93	Re: Truck dies when in gear I remember my dad's chevelle doing the same thing. I asked my dad about it because he messes with 700r4's and his chevelle was doing the same thing. He said the guy who built the transmission had something backwards in the transmission. He isn't sure what it was but the guy swapped around and it run fine ever since.

03-03-2016, 10:31 PM	#6
1955 mancave Registered User Join Date: Jul 2011 Location: Scottsdale Az. Posts: 325	Re: Truck dies when in gear if your converter is bad that will cause it to die __________________ 1964 1 Ton flatbed service truck (sold) 1964 C-10 panel (project complete frame up build) 1957 210 post pearl orange

03-03-2016, 11:24 PM	#9
2manycars2littletime Registered User Join Date: Feb 2016 Location: Troy MI Posts: 14	Re: Truck dies when in gear Lock-up torque converter not disengaging? __________________ Keep your head up...and your stick on the ice.

03-03-2016, 11:54 PM	#10
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,733	Re: Truck dies when in gear If you suspect the tranny or lockup just 'hot brake' it! Bring the rpm's up slightly (about 1000 rpm) with your foot on the brake and slip it into gear. Feather the throttle with the brake on to keep it running. Then slowly decrease the rpm so it will idle in gear. If it keeps running it's not tranny related. If it dies it's timing related.



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