No Start

at dusk · 05-10-2009, 03:32 PM

hey guys... heres what happening.. the truck is firing , getting fuel, and all the air it needs.. the issue im having is i get back fire and some times a flame out of the carb..

what issue is causin the problem?

RollinLo64 · 05-10-2009, 05:48 PM

what kind of vehicle/engine? sounds to me like possibly distributor is 180degrees out.. but that of course depends on your vehicle and what kind of engine it is...

at dusk · 05-10-2009, 07:08 PM

is a 73 mazda pick up
the engine is a 4 cylinder b1800
i checked to make sure the right valves were opening and the rotor is in the approtriate position and it all checks out.. i too thought i might be 180 out.. so i double checked my double check..LOL... i put the intake on the carb and the back fire then went to the exhuast side.. my thought is it could be the valve lashing... the valves not closing all the way...

what do you think about this?

Hack Job · 05-10-2009, 11:02 PM

is the timing set right? i would start there.

wylde1 · 10-20-2009, 05:06 PM

Definatly sounds like timing to me. try turning your dist a bit either direction to see if it helps at all, may not start, but if the backfiring goes away you've found the problem.

usually if the valve isn't closing all the way you won't have much (or just bad) compression, do you have a compression gauge you can hook up in the plug port? if it's low you might be on to something with the valve lash.

at dusk · 10-26-2009, 09:46 AM

found the issue.. you cant machne the heads on these engines or you cant ever time it again unless you use a spacer.. soo.. 350 bucks on a rebuilt head.. wasted.. no big deal.. i got a bigger better plan for winter

steve

gtxsmitty · 10-27-2009, 04:49 PM

ouch!
thats a drag eh

twenty · 11-01-2009, 08:54 PM

Ouch that sucks

05-10-2009, 03:32 PM	#1 (permalink)
at dusk Join Date: Dec 2008 Location: alberta Posts: 89	No Start hey guys... heres what happening.. the truck is firing , getting fuel, and all the air it needs.. the issue im having is i get back fire and some times a flame out of the carb.. what issue is causin the problem?

05-10-2009, 11:02 PM	#4 (permalink)
Hack Job Built not Bought Join Date: Dec 2008 Location: Langley B.C. Posts: 72	is the timing set right? i would start there. __________________ 91 sonoma bagged 99 sonoma DD zeroclearance.ca

10-27-2009, 04:49 PM	#7 (permalink)
gtxsmitty Minimal Clearance Join Date: Oct 2009 Location: Durham Ontario Posts: 420	ouch! thats a drag eh __________________ Kris "smitty" Smith Minimal Clearance Pres. Southern Ontario

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05-10-2009, 05:48 PM	#2 (permalink)
RollinLo64 Join Date: Aug 2007 Posts: 134	what kind of vehicle/engine? sounds to me like possibly distributor is 180degrees out.. but that of course depends on your vehicle and what kind of engine it is...

05-10-2009, 07:08 PM	#3 (permalink)
at dusk Join Date: Dec 2008 Location: alberta Posts: 89	is a 73 mazda pick up the engine is a 4 cylinder b1800 i checked to make sure the right valves were opening and the rotor is in the approtriate position and it all checks out.. i too thought i might be 180 out.. so i double checked my double check..LOL... i put the intake on the carb and the back fire then went to the exhuast side.. my thought is it could be the valve lashing... the valves not closing all the way... what do you think about this?

10-20-2009, 05:06 PM	#5 (permalink)
wylde1 Join Date: Oct 2009 Posts: 1	Definatly sounds like timing to me. try turning your dist a bit either direction to see if it helps at all, may not start, but if the backfiring goes away you've found the problem. usually if the valve isn't closing all the way you won't have much (or just bad) compression, do you have a compression gauge you can hook up in the plug port? if it's low you might be on to something with the valve lash.

10-26-2009, 09:46 AM	#6 (permalink)
at dusk Join Date: Dec 2008 Location: alberta Posts: 89	found the issue.. you cant machne the heads on these engines or you cant ever time it again unless you use a spacer.. soo.. 350 bucks on a rebuilt head.. wasted.. no big deal.. i got a bigger better plan for winter steve

11-01-2009, 08:54 PM	#8 (permalink)
twenty l33t h4x0r3d Join Date: Oct 2006 Location: Winnipeg Posts: 685	Ouch that sucks

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