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03-23-2015
I have a 98 grand prix se 3.1 L V6. Recently the intake manifold and head gaskets blew. I have replaced both and a few parts that were worn or I broke during the process. After reassembling the motor I cannot get her to start. Ive checked for fuel, spark, and the starter.. all are good. What else could be the cause? Keep in mind that I have never done a fix of this size. Just recently got into working on cars. any help would be appreciated.
03-23-2015
will it crank?
03-23-2015
Firing order incorrect?
03-23-2015
Yeah it cranks but wont turn over. Only a back fire every so often. And yes the firing order is correct. Could it be jumped timing?
03-23-2015
wheres the back fire coming from? if its the out the TB thats a timing or plug wires are on wrong.
03-23-2015
Cylinder 1 is on the rear, so 1,3,5. Not saying you are wrong but alot of people think it's like a 3800 were cylinder 1 is on the front bank.
It's a timing chain motor, very very unlikely that it jumped time. It would have snapped the chain if anything.
03-23-2015
Ok. Yeah. I know 1 3 5 is on the back. The backfire is coming from under the hood for sure.
03-23-2015
Would the pistons still move if the chain is broken?
03-23-2015
Yes, just the cam wouldnt.
03-23-2015
pistons sill move, broken chain, the rockers would stop moving.
03-23-2015
Rockers move for sure. Could the spark plug gap cause it to not turn over? Like I said, im new to this and learning as I go. And I really appreciate all your Input
03-23-2015
The camshaft position sensor is the problem I think.. the wires are exposed.
03-23-2015
id double check all your plugs are back where they belong, re check the plug wires for sure.
did you check for spark and saw spark? and theres fuel to the rail too you said right?
03-23-2015
Originally Posted by Jeremey Souders
that will do it. you can take that pig tail off cut the wires off and solder in new wire. you need to cut back the old wire till you get to clean shinny copper wire. dont try to solder to dirty tarnished wire, it wont solder well at all.
if theres not enough wire to solder to you can buy a new pig tail for it and solder that on.
03-23-2015
Im about to put it back on and see what happens. Cleaned all the wires and re wrapped them. It ohms so hopefully it works will update shortly.
03-23-2015
Ok that didnt do it... gona re check plug wires. Unless the sensor itself is bad.. I dont know what else it could be.
03-23-2015
Calling it a night. It still wont turn over. Double checked plugs and wires. All sparked. The number 5 wire when I pulled it out the connector was still on the plug not in the wire. Still got spark though.
BACK STORY.
It had been overheating for a while. To the point it would shut down before I could pull safely off the road. When it finally died the last time there was oil and coolant mix all over the motor. Thats what led to me replacing the gaskets.
03-23-2015
Welp, other things off hand I'd do it unplug the MAF and try starting it.
Spraying brake cleaner down the throttle body and see if it will start with a boost from that.
Double check all IGN fuses.
03-24-2015
Ive tried spraying starter fluid into the air flow. Got nothing. What would unplugging the MAP do?.
03-24-2015
if it dont fire up with starting fluid sprayed in the tb, its a spark problem of some kind.
its the maf you would unplug. some times a bad maf can do this. unplugging it put the car in closed loop, aka pre set setting the engine runs off of.
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