At Fixya.com, our trusted experts are meticulously vetted and possess extensive experience in their respective fields. Backed by a community of knowledgeable professionals, our platform ensures that the solutions provided are thoroughly researched and validated.
No spark? If you have a multimeter turn to 20v and unplug cable to coil pack on top of motor. Run positive to middle wire and ground wherever (neg batt terminal) and see what volts you get with key turned to ON (not starting). If 0.0 then either your ASD (MFI) relay is bad or your ECU is not grounding it or it's shot. All power to ignition and fuel pump goes through the ASD relay.
Basically you want to test jumping (bypassing) this relay. Not sure about your model but it has one somewhere. My 95 Talon it's by the brake fluid reservoir (2nd from left by fuel relay). Hotwire 87 to 30.
If still no spark look into crank position sensor, camshaft angle sensor or ECU.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
all cars must crank first, if no crank it can never start unless its a M/T car (stick) and you push start it. it cranks robustly, i will ASSUME. since you said spark is dead, on all 4 spark plugs??? or just one. no power?, spark has 2 powers. the primary side, and the high voltage (danger) side. i guess you meant no HV spark but on how many?
with all electrical failures, the first step is, check all fuses. open the glove box ,extract the oper guide and read the page called fuses. shows them all, in cab and engine bay. are they good.? Use and ohmmeter, to test fuses. fuse that look bad are, fuse that look good, can be bad,
if all spark is dead on all 4 spark plugs, the CKP sensor my be dead, 2.0L engine? I4, has 4 spark plugs. (with COPS) Check list: 1: all fuses good. 2: dash lamps work and head lights, engine cranks FAST. (normal) 3: key on, (noat cranked) CEL lamp comes on, does it? if not, the ECU is dead. (or fuse blown to PCM )
4: all spark dead? yes? then, attach any $9 scan tool, is RPM showing while cranking, for 5 seconds, yes, CKP is ok (CKP is the CRANK sensor. no, its dead. and see P0340 and 355s DTC codes, BINGO!that! see scootty? http://www.youtube.com/watch?v=064Ilsz8Fzg&NR=1&feature=fvwp
dumb questions, using a strobe light does not prove out spark ! can i assume the spark test is with real test spark plug ? not other ways? (say so) use a real spark plug to test spark. with proper gap set and shell of spark plug grounded. in the USA, (not stated ) the 2L has 4 COP coils we must check spark at each end of each COP tip (boot end). if JUST (say)#1 is bad, that is TYPE A failure (a bad cop?) if all 4 are dead? that is TYPE B failure. bad CKP, or bad CMP in english , bad cranks sensor or bad cam (I) sensor.
the FSM is online, and the tests are there, a real FSM is the best doing DIY work with out the book is near impossible, and 10x that , after 2004 or so (insane complexity began) some cars have immobilizers. or alarms that cut spark. i cant see your car or its options.... i can only presume you read the operators guide, and watched the dash lamps as it instructs you. keep in mind all web help is blind. and in this complex world , makes for bad advice (even mine)
Well it looks like you have a basic GM 3 coil setup on a GM style ignition module. So if you have power on the black orange wire, and the crank sensor is working, you would need to switch out the module with a known good part to test it. I'm assuming you don't have injector pulse from the computer also, right ?
I assume you mean it will not spark. You would need to check the ignition module the coils are attached to for power and signals from the crank and cam sensors. You may need a shop manual for the testing procedure.
spark,fuel and compression are the 3 needed things. If your friend can feel a flow of exaust at the tailpipe , we will assume it has compression.Pull a plug wire ,at the plug A spare plug would be best here ,but . Even a screwdriver in the wire and find a spot to lay it on the engine so there is like 1/4 of an inch from a good ground ,crank it and watch for spark, if it's there ,chances are you are looking at a fuel pump.
could very well be a faulty sensor, leaky vaccum hose, bad coil packs, needing of new fuel filter, spark plugs, wires.
Have you checked your fuel pressure to make sure it is good. You can do this with fuel pressure tester on the fuel rail.
Also check every cylinder for spark If you don't have any spark, or very weak spark, you could have bad coil pack, module, or crank sensor.
You can remove one plug at a time, and place it back on plug wire, place it on top of engine block, have someone else turn motor over well you observe to see if there is spark.
Do you have a service or check engine light on? If so, I would have the engine codes read to pinpoint exact problem area.
Let me know if you have any questions or need further help
Have someone check for spark at the plugs,if no spark either the crank sensor or cam sensor has gone bad,and making a guess from working on these I would say the crank sensor but you should be the mil lamp "check egine light" to come on and set a fault code,this assumes the engine cranks over and fuel system is ok
Honestly it's probably just dirty spark plugs. Did you pull any of the spark plugs and inspect the tips for build up? A couple things to remember:
1.) If the timing chain broke, the valves wouldn't be opening so you wouldn't have any air coming out of the exhaust during crank. You said it smells like you're getting fuel, so I'm assuming that means you're smelling the exhaust fumes, right?
2.) The crank sensor tells the ignition system when to send a spark to the plugs. If you're getting good spark, it's unlikely that the crank sensor is faulty.
If it's too soon for spark plugs to need replacing, check your sensors. A faulty oxygen sensor for example could cause your engine to run 'rich', resulting in faster crud build up on spark plug tips.
×