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Local dealer can get it wednesday for 149.00 I assume there the same part
well no turning back came out 76 buck
I don't want to even test CKP just change out because i don't even know where to start troubleshooting, if it checks out good. So *** it. I told he it's not 100% so if it dont work you have to find a good electrical shop not mechanic shop. So my hands are washed from owning him any money if it doesn't work.
Last edited by helga203; Mar 28, 2026 at 05:46 PM.
Local dealer can get it wednesday for 149.00 I assume there the same part
well no turning back came out 76 buck
I don't want to even test CKP just change out because i don't even know where to start troubleshooting, if it checks out good. So *** it. I told he it's not 100% so if it dont work you have to find a good electrical shop not mechanic shop. So my hands are washed from owning him any money if it doesn't work.
So you already go the header off and wiring is good to go?
Well i'm probably the only c5 owner that prayed and prayed that i would get a code after cranking for 15 seconds aaaaaannnnnnnnnndddddddddddd. NO CODES and the tach is not moving and no RPM's on scanning with HPTuners which should show around 150 to 200rpms but nothing. so i'm back where i started, going to take a chance and change the CKP sensor. Well i'm definitely not a person to count on luck just throwing parts but i think i did du dilagents on this issue so i'm going to test the CKP sensor before we commit to buying a new one. I really hope it test bad. If it doesn't test bad i don't even know where to start to troubleshooting this issue. So first things first is to get to the sensor, so we can test it and take i from there.
If it starts tomorrow morning ill let it get up to temp and hopefully it will stop running again when it gets up to temp and then we will proceed to check the sensor while hopefully it failed.
In the meantime if anybody has any ideas let me know. Thx.
I certainly think it's worth trying. My car had a similar no-start problem when hot. I never had a problem with it stopping running while I was driving. After sitting for 20-30 min it would start and run normally. I never got any codes. Changed the cps, and it's been fine ever since for years.
Helping a friend. 1999 c5 coupe stock.
He was driving and the engined shut off. No codes. Got it towed to my house.
Checked all fuses that pretian to CKP sensor, Injectors ,coil packs and map sensor.
Car cranks no start. Fuel psi 60.
Start with map sensor. A- Blk/white wire low ref ground gets 5v from C-orange 5v supply and orange to neg battery gets 5v. key on engine off B- signal wire to A- low ref ground is 1.5v when i pull vacuum volts go down to .25v at -20hg.( HPTurenes scanning shows 15kpa not 95kpa when engine off key on.
I have not checked CKP sensor valves or wires yet saving that for last since starter has to come out. But when cranking tach does not move and verified with HPT rpm stays zero so no signal from sensor when cranking.
Ignition coils main connect with 7 pins. orange gets 12v to ground but when i check supply 12v orange wire to the other wires they all get 12v but if i check each other wire to ground all get 0v. and when i check for continually from supply 12v wire to ground i get continuity. All the other wires to ground i get 1000omhs.
When i check the 4 wires to each coil i get 12v Pink supply and pink to check each of the 3 wires shows 12v from pink When i crank pin c firing signal get no volts no spark.
Fuel injectors 2 wires. Pink gets 12v to ground stripe to ground 0v
stripe wire with test light to ground when crank does not blink so no signal from PCM same as coils. When i check between pink and the stripe wire i get 7.8v This is unpluged from injector
So since i didn't physically check the CKP sensor. Can a bad CKP sensor effect all these other issues. Hope it makes sense.
One lead on the orange wire to ground 12v . And from orange to each other wire i get 12v. But each other wire to ground 0v and from each other wire to each wire but orange is 0v. This is main feed to coils
Pink wire to ground i get 12v. From pink to each other wire i get 12v but the 3 wires to ground i get 0v. Green is the signal wire when crank 0v no signal.
I searched but cant find a 1999 pcm wiring diagram. If these are related to the PCM. Have not back proded to PCM yet. Don't have diagram.
And from ground wire from coils to + battery i get 12v Wire on the back of head. Yes cleaned the grounds to car chassis.
Any ideas or any questions to verify any or all confusion.???
Checking voltages and resistances is a long, tedious trail of tears and disappointments.
Checking continuities all along wires and between and amongst connections is a good idea.
Checking voltages and resistances is a long, tedious trail of tears and disappointments.
Checking continuities all along wires and between and amongst connections is a good idea.
No he gave the go ahead didn't want to wait he wants to have it on hand no matter what sicne its 25yrs.
Right, but you might as well pull the header now, that way if you find damaged wiring you can order a pigtail (which is readily available) and probably get both parts at the same time...........or......you can just be surprised when go to change the sensor. I don't get the impression you like surprises though.
Right, but you might as well pull the header now, that way if you find damaged wiring you can order a pigtail (which is readily available) and probably get both parts at the same time...........or......you can just be surprised when go to change the sensor. I don't get the impression you like surprises though.
Its has call he's doing the work. I told him to start taking it apart. You can bring a thirsty horse to water but u cant make him drink it.
Now the car wont start at all
OK guys, updte got to start off WTF happened to GM. All wires was good. Installed car started right up. He's been driving it everyday. After install i had him shake the **** out of the wires every day before start up and no issues. But i told him it was not my fault we bought from GM site that acutely supplies GM dealers. So you tell me.
I told him i found a dealer that had 1 in stock and he brought the package and the pic. And it was the same. as dealer. So the long out come of this issues i have i ideal.The one on Amazon does not have the china on their CKP or that is just a generic pic which they use. He understood and if it goes out he knows how to change it now so my handes are washed from this situation.
