No spark

230

Asked by ricky Aug 15, 2018 at 09:12 PM about the 2007 Pontiac Grand Prix GT

Question type: Maintenance & Repair

I've got a 2007 Pontiac Grand Prix. Just did my head
gaskets and I wasn't getting feel after that. Changed the
crank position sensor, now I get fuel but I don't get Spark. I
have power to the coil packs, but no power to the plugs.
What do you guys think can be going on?

20 Answers

7,455

The crank sensor is what controls spark and it's timing so I think there's something else up, maybe you've missed reconnecting something or a ground wire

3 people found this helpful.
230

Well it had spark before I did the senser. The only two things I can think of are faulty senser or the whire got clipped some how

3 people found this helpful.
230

NinjaXxChicken the ignition module is plugged in and I don't have a voltmeter to read and see if the crank position sensor is getting power, I will have to go pick one up tomorrow. And it's weird that changing the crank position sensor fix the fuel problem but started a spark problem, so I will go ahead and check the power to the CPS and also check that relay

2 people found this helpful.
7,455

You'll want to do a resistance test on the crank sensor also and compare against what the values should be

230

I believe you LOL, I was just saying it's been a headache. My take this advice cuz a couple other things I thought about and see what happens tomorrow I still can't figure anything out nothing happens then I will get back with you guys.

230

Well ran some test looks like it's still not pissing fule out the injectors

3 people found this helpful.
7,455

How did you test? I pull a spark plug or two after cranking and see if they're wet with fuel or not. If dry I first check fuses and relays then power up the fuel pump manually to make sure its working and that fuel is passing through the fuel filter as those are all free tests if you have a multimeter and some cheater leads. If it passes those tests all thats really left is the camshaft position sensor, ignition control module amd ecu

1 people found this helpful.
230

I pulled the whole fuel rail out and had somebody turn it over and just watch the injectors to see if he'll would come out, no fuel came out. I ran a spark plug test light to each plug off the coil pack and they all were getting power sprayed some ether in there to give it to start up and it started and ran for a minute till I stop spraying ether in there

1 people found this helpful.
230

I also replaced the cam position sensor today and seeing if the injectors were all good. I ran a home test on him to see if there was any resistance, and I ran a direct power line to him from the battery to see if they would push out any fuel. When I ran a test light from the negative terminal of the battery to the positive terminal of the injector plug it had no power. Also the car honks after I get done trying to start it and turn the key off. I'm seeing something that says that it's the anti-theft system, but I'm not sure about that. My main thing is I really don't want to put it in the shop, I already did the head gaskets myself LOL

1 people found this helpful.
7,455

Then you're missing something as is not plugged in or hooked up would be my guess.

230

I have gone through and looked at everything. Everything is hooked up I unplug plugs and replug them back in as well. Sometimes I get spark sometimes I don't. But I don't get fuel at all that's what I just figured out today

2 people found this helpful.
7,455

In that situation I start at the back (fuel pump) and work my way forward. Unhook the fuel filter and turn the pump on manually. Just for fun reinstall your old crank sensor if you haven't tried that already. I've personally never had a no start after changing head gaskets, trouble getting the fuel system primed back up sure but never a no start

2 people found this helpful.
230

Ya h I'm lost for words on it lol. I'm putting it in the shop Tuesday and I'll see what they say it is. Becouse I've checked everything.

2 people found this helpful.
7,455

It's frustrating sometimes there no doubt about it! Hopefully it's nothing major and they can sort it out easily. Kudos for giving er a go though!

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