Truck dies after going into reverse. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Reziel_1983 · 02-14-2011, 06:32 PM

So I put my old quadrajet on after I put a new, bigger cam in my engine(350). We couldn't get the timing right with the edelbrock 600 cfm we had in before, so we swapped it out for the quadrajet and now it is in time. However, now whenever I shift into reverse my truck will die... it will idle REALLY low and then just die. Does my carb need to be rebuilt? I tried idling it up some... it didn't seem to help it.

**Clyde65** · 02-14-2011, 07:02 PM

Idles low, like under 600rpm?

If so, when you shift into reverse you are putting a load on it and that might be the cause of it dying. check timing first then adj your carb settings. also what cam did you put in there?

Reziel_1983 · 02-14-2011, 07:42 PM

Quote:

Originally Posted by Clyde65

Idles low, like under 600rpm?

If so, when you shift into reverse you are putting a load on it and that might be the cause of it dying. check timing first then adj your carb settings. also what cam did you put in there?

I'm not sure how many rpms it is getting when it idles lower. But It's LOW.

Also, not sure what the exact specs on the cam are... I can maybe get them, I'll try. Before this cam I had a Crane Cam that was I believe one step above stock. I think this new cam is 2 or 3 steps up from my old one. At first it would just idle really low after shifting into reverse but then it would catch up and it would idle higher and I could go, but now it dies almost every single time I put it into reverse, even if it's going from drive to reverse.

**Clyde65** · 02-15-2011, 10:58 AM

It sounds like you timing might be off or there is a vacumn leak. I say this because when you shift into Drive or reverse, the trans pulls more vacumn and the engine sees that and bumps the timing a little

mag68 · 02-17-2011, 01:54 AM

Maybe i missunderstood your problem, but you said "after installing a bigger cam". I assume you have an auto trans. You may need a higher stall torque converter. I rebuilt my 454 and it wouldnt idle in gear. I went to a 2800 stall and it worked great.

geezer#99 · 02-17-2011, 10:31 AM

REcurve your dizzy. Less mechanical in the dizzy and more initial timing.
x2 on the convertor.

spudz · 02-17-2011, 11:07 AM

sounds like you have too big of a cam for your stock convertor.... Not my truck but I wouldnt install a cam and not know what the specs were.... Also, my experience.. stock q-jets dont work well with big cam. I;m sure they can be tuned to run just fine but I never had good luck.

02-14-2011, 06:32 PM	#1
Reziel_1983 Registered User Join Date: Feb 2011 Location: Brownwood, Texas Posts: 421	Truck dies after going into reverse. So I put my old quadrajet on after I put a new, bigger cam in my engine(350). We couldn't get the timing right with the edelbrock 600 cfm we had in before, so we swapped it out for the quadrajet and now it is in time. However, now whenever I shift into reverse my truck will die... it will idle REALLY low and then just die. Does my carb need to be rebuilt? I tried idling it up some... it didn't seem to help it. __________________ 1983 Chevy lwb: 400 sbc destroked to 377, comp cams xe 268, Holley Street Dominator Intake, Holley Street Avenger 670 cfm, headers, flowmasters. SOLD 1998 Trans am, mostly stock with magnaflow catback My build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=454329

02-14-2011, 07:02 PM	#2
Clyde65 1965 Chevy C10, 2005 4.8L/4l60 Join Date: Aug 2004 Location: DFW Texas Posts: 8,546	Re: Truck dies after going into reverse. Idles low, like under 600rpm? If so, when you shift into reverse you are putting a load on it and that might be the cause of it dying. check timing first then adj your carb settings. also what cam did you put in there? __________________ Clyde65 Rebuild of Clyde http://67-72chevytrucks.com/vboard/s...84#post8338184 69 Aristocrat Lo Liner build http://67-72chevytrucks.com/vboard/s...84#post7561684 *support our troops!*

02-15-2011, 10:58 AM	#4
Clyde65 1965 Chevy C10, 2005 4.8L/4l60 Join Date: Aug 2004 Location: DFW Texas Posts: 8,546	Re: Truck dies after going into reverse. It sounds like you timing might be off or there is a vacumn leak. I say this because when you shift into Drive or reverse, the trans pulls more vacumn and the engine sees that and bumps the timing a little __________________ Clyde65 Rebuild of Clyde http://67-72chevytrucks.com/vboard/s...84#post8338184 69 Aristocrat Lo Liner build http://67-72chevytrucks.com/vboard/s...84#post7561684 *support our troops!*

02-17-2011, 01:54 AM	#5
mag68 Registered User Join Date: Oct 2010 Location: College Station, Texas Posts: 8	Re: Truck dies after going into reverse. Maybe i missunderstood your problem, but you said "after installing a bigger cam". I assume you have an auto trans. You may need a higher stall torque converter. I rebuilt my 454 and it wouldnt idle in gear. I went to a 2800 stall and it worked great.

02-17-2011, 10:31 AM	#6
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,732	Re: Truck dies after going into reverse. REcurve your dizzy. Less mechanical in the dizzy and more initial timing. x2 on the convertor.

02-17-2011, 11:07 AM	#7
spudz Registered User Join Date: Oct 2005 Location: Branchville SC Posts: 1,647	Re: Truck dies after going into reverse. sounds like you have too big of a cam for your stock convertor.... Not my truck but I wouldnt install a cam and not know what the specs were.... Also, my experience.. stock q-jets dont work well with big cam. I;m sure they can be tuned to run just fine but I never had good luck. __________________ 2004 z71, 96 z71 on 38s, 88 Chevy k5 blazer, 4in lift. 84 swb project, 82 SWB project , 84 chevy 4x4 lwb project, 88 Jimmy beater/highschool ride. 79 c30. 99 tahoe 4x4 project. and a bunch of parts trucks..



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