car wont crank for long when spark plugs are installed - Performance Forum

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car wont crank for long when spark plugs are installed
Sunday, August 05, 2007 6:06 PM
ok so lets make this as short and sweet as possiable.


with out the spark plugs installed, the car will crank via the crank pulle/breaker bar with litte force. and when the motor is turned over it spins slow but realiably with the starter.

but the second the pulgs are installed, it gets hard as hell to crank the car. when we hit it wit the starter, it barely spins once the wont spin again.

howerver whats thorwing me off is that it spins at all. if it spins at all shouldnt it get easier to spin once it gets going. it has the tell tail signs of @!#$ty voltage, but theres no voltage drop across the lines. however I dont have a VAT to test amps, I still have a feeling It doesnt have enough muschle.
Im going to try and spin it with a fresh battery hooked to the starter. and see if that helps


I guess what Im getting at, is what would make a car have trouble spining, once compression is added to a fresh motor, or am I coreect in thinking that my starter just needs more jucie, and also how eles can I thorw more power to the starter?


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Re: car wont crank for long when spark plugs are installed
Sunday, August 05, 2007 6:13 PM
ummm, about 100ft-lb of torque more is required once compression is added.

Your battery, alt, and/or starter is fried.



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Re: car wont crank for long when spark plugs are installed
Sunday, August 05, 2007 6:15 PM
i would look at the starter. sounds like its fried to me.



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Re: car wont crank for long when spark plugs are installed
Sunday, August 05, 2007 6:25 PM
Owen wrote:ummm, about 100ft-lb of torque more is required once compression is added.

Your battery, alt, and/or starter is fried.

read my mind



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Re: car wont crank for long when spark plugs are installed
Monday, August 06, 2007 5:12 AM
did you take care of the other problem?



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Re: car wont crank for long when spark plugs are installed
Monday, August 06, 2007 7:19 AM
yeah man, when the plugs are out, you're not making any compression... thus, its easier to turn by hand. Thats why most service manuals tell you to pull the plugs before doing the timing chain/belt on cars, because it makes it easier to turn the crank to TDC. As everyone else has said, you either have a battery or starter problem. I'd try charging the battery a bit first before you spend any money, since I know your car has sat for a while it may just be discharged.



Re: car wont crank for long when spark plugs are installed
Tuesday, August 07, 2007 4:27 PM
I bench tested the starter at pepboys, and it passed with flying colors. at least the machine said so the jack tards behind the counter couldnt help me one bit.

Im almost postive that its power to the starter. I really need to hit it with known good volatge before I can rule that out.

next step in a diag would probably lead to mechanical drag, either in the starter when clicked on, or in the motor. although Im really hoping its my power. Ive doged one bullet so far, I really need to dodge this one.

guys Im close please throw some good vibes my way. Im running out of time money and options.


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Re: car wont crank for long when spark plugs are installed
Tuesday, August 07, 2007 5:05 PM
when you bench test a starter it doesn't put any load on it. I would not be surprise if the starter is bad.



Re: car wont crank for long when spark plugs are installed
Tuesday, August 07, 2007 5:26 PM
Sunfires... eh (Tom) wrote:when you bench test a starter it doesn't put any load on it. I would not be surprise if the starter is bad.


x2. bench testing a starter only tests if the bendix fires and the starter motor spins. there's no way to safely bench load test a starter. it could easily still be bad.



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Re: car wont crank for long when spark plugs are installed
Wednesday, August 08, 2007 4:47 PM
hmm any sugesstions for a test?


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Re: car wont crank for long when spark plugs are installed
Wednesday, August 08, 2007 6:03 PM
test the battery first and starter cable. If those are good, it got to be the starter.




Re: car wont crank for long when spark plugs are installed
Thursday, August 09, 2007 4:38 PM
problem is I dont have a VAT, so I have know way of showing amprage. I try to test with My meter the damn things gonna blow sky high. as for the connections I showed know voltage drop across the board, and my grounds are supposedly good, but I think I @!#$ up my test.

I just need to hit it with a direct connection.


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Re: car wont crank for long when spark plugs are installed
Thursday, August 09, 2007 6:54 PM
get yourself a known strong battery. if your cables arent good, replace them. if its still not that, you know its the starter




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Re: car wont crank for long when spark plugs are installed
Thursday, August 09, 2007 7:20 PM
to test the starter, hook it up to the battery and grab the sprocket as it comes out. if it rips ur fingers off then its good.

take a battery out of a daily driven car if ur strapped, give that a try



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