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No start backfire through intake

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Old 10-20-2011, 11:12 PM   #1
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Angry No start backfire through intake

I washed all mud off the bottom of my 96 zr2 the other day, and today (rainy as heck) i go out and try to move it and it won't start, it just cranks and cranks with no start, it just backfires when i let off the key and runs backwards for a couple turns. I have spark, i have compression and i have fuel, what the hells wrong. Pulled the cap looks fine, tried spraying carb cleaner in the intake(redneck starting fluid), i checked the valve timing, i'm running out of ideas.
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Old 10-20-2011, 11:35 PM   #2
i saw what you did there!
 
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Re: No start backfire through intake

does it have a crank sensor at the balancer?

if so then its probably failing faulty

what is fuel pressure at key run position prime up time?

check ground wires if there are any at the thermostat housing

check for any small bad wires around battery or junction block

cables clean dry and tight at all ends

any bad ecm fuses

MAF failure is another one, if so equipped

try firmly tapping on it, see if any change

and if there is change in it when doing this the next time it is running then do replace it

make sure air intake ducting is all intact and no leaks

it may not start if not all intact and tight

if all above checks out then see how much slop wear is in the distrib, it may be sloppy erratic signal, enough to prevent starting


also security system?

clean key and key tumbler slot real good with cleaner
Old 10-21-2011, 04:34 PM   #3
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Re: No start backfire through intake

Tried changing the crank position sensor and still nothing, i had the maf sensor unhooked, tried hooking it up still nothing
Old 10-21-2011, 05:50 PM   #4
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Re: No start backfire through intake

I just went through and checked compression on it and i have 150psi across the board, plugs look wet from cranking the engine over so much but the still spark just fine.
Old 10-21-2011, 09:35 PM   #5
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Re: No start backfire through intake

check the fuel pressure. needs to be close or above 58lbs or it will not start.
Old 10-21-2011, 11:07 PM   #6
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Re: No start backfire through intake

fuel pressure is 65lbs
Old 10-22-2011, 02:07 PM   #7
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Re: No start backfire through intake

Quote: Originally Posted by ckrummy
fuel pressure is 65lbs
Thats good pressure. Did you check to see if it holds? A leaking fuel pressure regulator can cause backfiring. If fuel pressure holds, then your coil may be weak in the secondary. It will produce spark but not strong enough to ignite the fuel. White powder on the coil wire indicates a voltage leak.
Old 10-22-2011, 09:42 PM   #8
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Re: No start backfire through intake

It turned out to be the distributor cap and rotor, it needed a tune up anyways, i was reluctant to start hanging parts because so many people have done that and still not fixed the problem.
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