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I have 2005 cavalier and when i went to start it it fired for a split second then died. now it wont start. i noticed the fuel pressure regulator was leaking fuel and i replaced it. i also cleaned the throttle body (removed to do so). then i went on to checking spark of which i had none on two cylinders. i used a test light on the icm to test it and i found the one coil bank was firing and the other was always grounded. i replaced it with a used one and i have good spark on all 4 cylinders. however it would not fire still. i pulled the plugs and they were wet. i did not check fuel pressure as of yet but i don’t think it is an issue. i puled off the valve cover and the timing chain seams fine (no slop). im not sure what to check next. can you still get spark with a bad crank sensor. ecm perhaps?
thanks for any help jackson
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When you hooked up the new ICM, did you connect all the plug wires to the right plugs? Happens to everyone at some point.
Yes I’m sure. I should have mentioned its a 2.2 ecotech engine. There is no way to cross the wires as there really isn’t any (coil on plug kinda)
Starting and stalling right away sounds like the fuel in the rail burned off and there wasn’t enough fuel being supplied to keep it running.
You might be looking at a security system issue.
While cranking, the CEL will be flashing when a security system issue is preventing starting
See details here http://troubleshootmyvehicle.com/gm/2.2L/fuel-pump-tests-2#3
Next check fuel pressure
Good link http://troubleshootmyvehicle.com/gm/2.2L/fuel-pump-tests-1
Other things that come to mind…
First check for codes that may offer a hint about the cause and then disconnect the battery to reset everything.
Make sure the battery is fully charged to eliminate any low voltage issues which can wreak all sorts of havoc.
When cleaning the throttle body, some gook could have gotten on the MAF sensor resistors and are preventing the ECM from being able to accurately calculate how much fuel is needed.Hope this helps you solve the problem.
Let us know what does.Right sorry. Can you spray some brake cleaner in the throttle body to finish eliminating fuel?
Do you know of anything that changed before the no start? How long had it been sitting? Any major changes in ambient temperature?
ok so i went and got some of my tools and i have good fuel pressure. but i have no compression 🙁 on any cylinder it wont even read on my tester. i pulled the valve cover and the timing chain seams tight and the cams spin round and round. it was running fine no smoke or anything untill this happend. i checked my tester on my snowblower and it pumped it up fine. could this be a head gasket or maybe the key on the crank for the timing chain. i don’t think it jumped it is to tight for that i think unless the teeth wore off the drive sprocket
Wwhhaaa? Never heard of zero compression on all cylinders. At least one cylinder must have its valves closed at some point, so if the crank turns, you have to get compression somewhere, unless you’ve cracked/holed all 4 pistons, which I’ve never heard of.
You wouldn’t get spark if the crank weren’t turning.
Check your assumptions. Something is missing.
Get a look inside those cylinders.ok so i started to double check my work.as i was doing this i turned both cams toward one another with a wrench and it did bring up some slack and while i did that the chain actually jumped fairly easy i din’t force it so i got my answer. it may have jumped when i hade the igntion trouble idk. thanks for all the help. fuel injected cars are a lot harder than my old dodge pickups lol
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