legacycentral bbs

Hey guys,
I've got a 94 ss that wont start. I was out driving around, car was running fine then I stopped at old Chicago to eat and came back out and the car wouldn't start. It cranks but wont start. I've checked the timing, replaced the cam and crank senators, coolant temp sensor, coil pack, checked for fuel all that stuff and still nothing. I don't seem to be getting spark from the coil pack. Is there a relay that may have gone bad or some other sensors to swap out. I've got a couple more MAFs i can try but I'm all out of ideas now.

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MAF won't change anything if you have already narrowed down that there is no spark. Is this an auto or manual car?

What about the ignitor?

If you know there's no spark, test the coil pack, igniter, and the associated wiring back to ECU.

Does the tachometer bounce slightly above zero when you're trying to start the car?

Its an auto, I swapped the ignitor and coil pack and nothing changed. I'm going to check to see if I am getting power to the coil pack and ignitor i just have to go to the store to get a multimeter first. The tachometer doesn't move when I try and start the car

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I have power to the coil pack. When I tested the cam sensor I got 0 from the yellow ground wire, 2.8 from the black and 2.0 from the white wire.

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I'm getting spark now but the car still wont turn over. The tachometer bounces now when I try to start the car. I've replaced both cam and crank sensors again along with the maf. Everything I can think of.. How much voltage should I be getting to the cam and cranking sensors?

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You said you checked for fuel, did you check and see if the pump functions 100%? also do you know when the fuel filter was replaced last? Finally i know this sounds stupid but are your battery terminals corroded terribly? you seem to be adept with the mechanics of these cars and know whats going on, but i just thought id ask anyways.

Yeah fuel is 100% good. I keep going back to thinking it has something to do with the cam and/or crank sensors. I was looking around on here to see how much voltage they should be getting but couldn't find it. I'm going to put new spark plugs in but i don't really think that's the problem because they were done not too long ago.

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Do u by chance have access to another ECU? I have a truck that was doing the same thing as your car. I through a lot of parts at it with no change then had access to another ECU, plugged it in and fired right up. Don't know if that helps u at all but.....just saying

I do have another ecu i can swap out. The only problem is i want sure there was a problem with it as well. Ill give that a try though

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If the tach wasn't moving and you replaced something and now it is moving, I would say that's probably heading down the right path of it being electrical/spark related.

I think the wiring to the cam position sensor was a little messed up so I redid it and after that the tach started moving. I've gotta run into the problem eventually right? I mean there's only so many more things to try before I get it.

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I highly recommend just doing continuity tests from each sensor to the ECU and verify your wiring. While you're at it check the resistance of each sensor to make sure they're good. If you spend some time doing that I think you'll be in better shape to try and narrow down your problem.

I tried swapping emu's and nothing changed. Are there any other sensors other than cam crank and the coolant temp that would keep it from starting? I'm going to test the injectors and and a few of those sensors to see if they are getting the correct voltage to them

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Have you checked the crank sensor?

I'd say get back to the basics, fuel, spark, & air in the right timing. Are you sure the fuel pump is running while cranking? Have you verified spark? Are the spark plugs getting wet from fuel during cranking? Have you verified the timing is correct; you'll probably have to pull off the crank pulley and timing covers to do this.

I've checked the timing several times now and that's fine. I'm getting between .25 and .35 volts the cam crank and coolant temps plugs. I took the fuel line off right before the filter and now I'm not getting fuel again. It doesn't make any sense one day it getting fuel then the next its not. It did the same thing a few days ago after I was working on it so I replaced the relay and was getting fuel again and it wouldn't start. So I started checking the sensors and all that stuff again and all the sudden no fuel again. I've checked the plug under the back seat and that looks fine. The fuel pump is brand new and only has probably 100 miles or so on it.

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I'm just running around in circles replacing the same parts over and over again day after day. I check for fuel air and spark and find that in not getting one (fuel) so I fix that and all the sudden now I'm not getting spark even though I was the previous day before I fixed the fuel problem. Then I get spark back and what do you know now there's no fuel again.

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You've got something funky going on. Are you 100% sure the fuel pump connector is good?

If you connect the green diagnostic connectors does the ECU cycle the relays including the fuel pump?

It would be nice to know if this was ever resolved, and what the fix was.

For real, I’d be interested to know what happened