ignition problems... help please - Team Camaro Tech
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post #1 of 18 (permalink) Old Mar 21st, 09, 05:40 AM Thread Starter
 
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Question ignition problems... help please

i have a 93 z28 camaro with a 5.7l v8 in it. while i was driving the other night it felt like shutting off on me while i was doing 40 in 3rd gear at about 3000rpm. both the check engine light and check gauges light popped on and i pulled over. after taking a look at the engine i didnt see anything unusual and no weird smells from it so i fired it back up and it was fine. once i reved it to 3000 again it cut out. got it flat bedded home and now im stumped. i changed the fuel filter, ignition coil, and got a brand new battery. there is still no spark at the plugs but im reading some kind of voltage at the new ignition coil. my guess is the distibutor is the problem but im not to positive. i dont wanna go out and spend the 250 on a new distributor when its just a bad wire....... thanks for any help.
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post #2 of 18 (permalink) Old Mar 21st, 09, 08:23 AM
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Re: ignition problems... help please

I'm not to keen on the newer motors and which type of distributors they are equipt with, but it sounds like your points fried out.

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post #3 of 18 (permalink) Old Mar 21st, 09, 08:35 AM
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Dale
 
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Re: ignition problems... help please

Any codes ?
Will it run now?
Dale

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post #4 of 18 (permalink) Old Mar 21st, 09, 06:51 PM Thread Starter
 
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Re: ignition problems... help please

what points are you talking about?? i cant grab a code from it cuz i been trying to get a friend of mine with a diagnostic comp over to my house but its like pulling teeth... it started right up the next morning but died out after a short rev.. now it just cranks and hasant started in over a week. im only 17 but i like to work on my own car and dont wanna just dish the car out to a repair shot yet....... thanks for the help
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post #5 of 18 (permalink) Old Mar 21st, 09, 07:18 PM
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Re: ignition problems... help please

LT1?
port fuel with optispark?
you stated that it fired the next day but quit and now does not attempt to start.
How do you know that you do not have spark at the plug?How do you know if you have any fuel pressure in the injector rail?
What is common is water pump seepage contaminating the optispark..high resistance between the coil wire and coil tower and the dreaded inop intank fuel pump swap.
Verify you have a hot spark at the plug while cranking and 45 psi in the fuel rail for starters.
retrieving the stored dtc,s will help..but in the mean time you can check the obvious with a screwdriver in the plug wire and a pressure gauge on the rail service port.

George
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post #6 of 18 (permalink) Old Mar 21st, 09, 07:43 PM Thread Starter
 
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Re: ignition problems... help please

yes lt1. not sure about the optispark fuel port.... i checked the spark at the wire first by holding it just off of the spark plang and the second with a DV meter... both times read nothing unless i did it wrong.... there is pressure in the fuel line but i dont have the gauge to check it...
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post #7 of 18 (permalink) Old Mar 21st, 09, 07:59 PM
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Re: ignition problems... help please

Quote:
Originally Posted by hockeyjr1 View Post
yes lt1. not sure about the optispark fuel port.... i checked the spark at the wire first by holding it just off of the spark plang and the second with a DV meter... both times read nothing unless i did it wrong.... there is pressure in the fuel line but i dont have the gauge to check it...
Shawn..you physically removed a plug wire from a spark plug and then inserted a screw driver into the boot and located that screw driver within a 1/4 inch of a known good ground while observing for a hot blue spark while cranking?
One thing at a time..hot spark at the plug verified first..you can easily introduce some fuel later for testing purposes regardless of pump pressure and injector pulse.

George
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post #8 of 18 (permalink) Old Mar 24th, 09, 03:56 PM Thread Starter
 
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Re: ignition problems... help please

yeah i tried that today and theres still not spark. i pulled off my cap and rotor and everything looks fine. still cant get my hands on a computer to diagnose it but i found you can do that through the check engine light on these?? ive tried it 3 times and all i get is the same 12 code..... am i doing somthing wrong or is there no code....
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post #9 of 18 (permalink) Old Mar 24th, 09, 04:33 PM
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Re: ignition problems... help please

Congrats on your new buy. I'm sure you've worked hard for the money to purchase the car.

First action you should take is to buy a Haynes manual for the make/model of car. It's invaluable as to the info held within.

From reading your posts, it reads as an intermittent problem. A Code 12 from the ALDL connector is a good sign-the ECM is working. Each DTC, diagnostic trouble code, for a hard failure, will be held in memory and be ready for recall when asked upon. The string of codes will flash each number three times, then the next code will flash three times and so on, until the list has been gone through, then the ECM will repeat itself.

So, returning to your problem - no start, er, no run. you have said holding the plug wire with a screwdriver from a good ground and cranking the engine over does not produce a spark. This symptom means the distributor, commonly known as the Optispark, needs replacement - very common problem with the LT-1 engine.

Along with replacement of the distributor, one usually changes the water pump also as the w/pump has to be removed to change the dist. Can you see a Snowball Effect here?

The rest of the Snowball is coolant has to be drained, new coolant?
New thermostat also?
New hoses and clamps?
New accessory belts?
New plug wires?
New spark plugs?
New air filter?
Oil change & filter change?

Please, don't get me wrong and I know you're on a budget, who isn't? But things to consider. I believe the most important would be the dist and water pump. You can use a coffee filter to filter the coolant back into the system - don't forget the air bleed to purge the air from the system. You will have to check coolant level quite often to get the level back up to prevent from overheating. Then tackle the replacement list later as monies arrive. The manual will tell & show you how to do them all. Its not the best, but better than nothing.

Shop around for parts to get the better pricing. However, remember, you pay for what you get. I'm sure other members here will agree.

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post #10 of 18 (permalink) Old Mar 24th, 09, 06:42 PM
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Exclamation Re: ignition problems... help please

Quote:
Originally Posted by hockeyjr1 View Post
... i checked the spark at the wire first by holding it just off of the spark plang and the second with a DV meter...
Meter is fried

Dave
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post #11 of 18 (permalink) Old Mar 25th, 09, 03:56 AM Thread Starter
 
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Re: ignition problems... help please

how would the meter be fried it still works on other batteries???
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post #12 of 18 (permalink) Old Mar 25th, 09, 05:24 AM
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Re: ignition problems... help please

Quote:
Originally Posted by hockeyjr1 View Post
how would the meter be fried it still works on other batteries???
You fried the AC function of the meter with the high voltage spike.

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post #13 of 18 (permalink) Old Mar 25th, 09, 06:29 AM
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Re: ignition problems... help please

Also you said you replaced your battery. When you replaced it you lost all your codes. That is why you only get a 12 now.

Or did you check for your codes before you replaced the battery???

Mike
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post #14 of 18 (permalink) Old Mar 25th, 09, 12:14 PM Thread Starter
 
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Re: ignition problems... help please

i had no clue i could flas the codes on my car so i never tried it ntill after i replaced the battery.... is there n e way for the code to come back up so i can read it again???
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post #15 of 18 (permalink) Old Mar 25th, 09, 04:01 PM
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Re: ignition problems... help please

Drive the car.

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