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This arvo I cranked the car over over and it didn't start. Did a check and then realised i hadn't plugged the coil pack in. Went to start again and after two hard cranks she backfired on me. A little worried! Checked my timing marks and all okay, my cam sprockets are 12oclock (dowels), 3oclock (exhaust) and 9oclock (intake) respectively, but i'm now doubting myself. So How many teeth can the exhaust cam sprocket be out before timing causes backfire?

Alternatively, i'm thinking i had an excess of fuel in the chamber since I was cranking so long without the coil pulgged in. Would this cause a backfire?

I'm not ruling out spark plugs, wires, coil pack, transistor or injectors.... Just worried about the important stuff first. Thanks.

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90 4G63BT LANCER GSR Cyborg, 14b, KM206, Xtreme XHD Clutch
92 4G61 LANCER GSR

Speed Thrills, Hesitation Kills!!!

Doesn't sound like a big problem, just had to clear out the fuel in the cylinders.

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Had a:
1991 Eagle Summit ES Hatchback - 4g15 12v 5spd
1991 Dodge Colt -4g15 12v 4spd
Have a:
1978 Oldsmobile Cutlass - 468BBO TH350
Round 3:
1990 Dodge Colt-4G63T 5spd

Have you seen the amount of fuel that is dumped out of the injectors in cold flood mode? When you test this with a single injector or even just the fuel rail in to an appropriately wrapped 2L bottle, you will understand just have much has gotten into the chamber and past the valves. Once you light up that mixture in the chamber, you will also light up anything in the exhaust stream and sometimes into the intake while cranking. Does the car run without problems now, or are you waiting to check if you have done everything correctly? If your timing marks are good, then you can run it without hesistation. If you have your timing off more than a tooth, you would have problems however. IIRC

Nope.

_________________
Had a:
1991 Eagle Summit ES Hatchback - 4g15 12v 5spd
1991 Dodge Colt -4g15 12v 4spd
Have a:
1978 Oldsmobile Cutlass - 468BBO TH350
Round 3:
1990 Dodge Colt-4G63T 5spd

I meant Waxie but you can be included too! hehe

Once it backfired i stopped cranking straight away and left it alone. I think maybe i'm being paranoid, because i was certain all my timing marks were okay. Before i plugged the coil in, during the hard cranking the motor seemed to be turning fine, no strange noises heard. Also when i removed a spark plug to check, it reeked of fuel.

Okay this afternoon when i get home from work, i'll try again. Keep you posted.

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90 4G63BT LANCER GSR Cyborg, 14b, KM206, Xtreme XHD Clutch
92 4G61 LANCER GSR

Speed Thrills, Hesitation Kills!!!

Woo hoo!!!!! All okay, i'm so relieved! Backfired slightly again then started fine Wow that start was along time coming... Thanks so much for your reassurance!

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90 4G63BT LANCER GSR Cyborg, 14b, KM206, Xtreme XHD Clutch
92 4G61 LANCER GSR

Speed Thrills, Hesitation Kills!!!

well when you think about it, it's a 50/50 shot you'd destroy your engine, and it's not like WE have anything to lose... HAHAHAHA, ok, i'm just kidding! but i'm glad your car fired right up!

Totally!!! But it was those few needed words that gave me the strength to turn that key again... I was seriously scared shiteless.... I knew i had done everything right tho and needed backup of this.... Anyway, onto the next problem, now my ecu's giving me hassles... (Yay!) God i love messing with cars.

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90 4G63BT LANCER GSR Cyborg, 14b, KM206, Xtreme XHD Clutch
92 4G61 LANCER GSR

Speed Thrills, Hesitation Kills!!!