No idle...need help - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

68 P.O.S. · 10-20-2018, 07:48 PM

That can definitely cause a vacuum leak

**HO455** · 10-21-2018, 09:34 AM

Quote:

Originally Posted by barrie2777

Something i noticed today...the gasket on the bottom of the ring around the carb is not there anymore but is a pile of pieces sitting near the valve cover. Could the absence of this gasket cause the problem?

It very well could. Try the spray test around the base of the throttle body to be sure before replacing.

barrie2777 · 05-03-2019, 07:30 AM

Just to bring this to an end....after changing map sensor, temp sensor, throttle body gasket dist cap and rotor, this engine still would not start unless gas was squirted down carb. Removed the distributor shaft completly and replaced with one from a 1989. Ran very well but sensor indicated map sensor high. This was a new part but swapped it for the old one in the 89. Engine runs perfectly! Did timing . I know have a new truck.ha.

**HO455** · 05-03-2019, 07:55 AM

Good to hear you solved the problem. Well done

barrie2777 · 05-03-2019, 08:18 PM

The bad thing is that I really cant say what was the problem but I suspect that the new ignition module was not right. Im not about to change things to recreate the problem.

10-20-2018, 07:48 PM	#26
68 P.O.S. Registered User Join Date: Jan 2007 Location: Puyallup, WA Posts: 1,662	Re: No idle...need help That can definitely cause a vacuum leak __________________ 72 C10 lwb fleetside -stock 350/350 combo

05-03-2019, 07:30 AM	#28
barrie2777 Registered User Join Date: Dec 2014 Location: Arundel,quebec Posts: 29	Re: No idle...need help Just to bring this to an end....after changing map sensor, temp sensor, throttle body gasket dist cap and rotor, this engine still would not start unless gas was squirted down carb. Removed the distributor shaft completly and replaced with one from a 1989. Ran very well but sensor indicated map sensor high. This was a new part but swapped it for the old one in the 89. Engine runs perfectly! Did timing . I know have a new truck.ha.

05-03-2019, 07:55 AM	#29
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 11,350	Re: No idle...need help Good to hear you solved the problem. Well done __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377

05-03-2019, 08:18 PM	#30
barrie2777 Registered User Join Date: Dec 2014 Location: Arundel,quebec Posts: 29	Re: No idle...need help The bad thing is that I really cant say what was the problem but I suspect that the new ignition module was not right. Im not about to change things to recreate the problem.

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