ignition advance?

[ctwright]

Originally Posted by 1996pmt

actually i just replaced the coil yesterday because it decided not to start at all. so now im back where i started. it starts perfect then it sputters and stalls. i can play with the throttle and it helps keep it running. it also jerks say around 45mph i try to maintain speed it will jerk when u ease off the throttle. fuel pressure reads fine but my spark is almost non existent after start up maybe a spark every three seconds or so.

I answered a minute ago then deleted after I realized I had a major brain fart. I'm not sure how many rpms you were turning when getting the spark every three seconds or so.

If you were turning 1300 rpms that is almost 22 revolutions per second.
That means that each individual plug should fire 22 times in a second. Look very closely and try to count you should be able to tell. Did you check each individual wire separately? Because if so and they all are 3 seconds apart that means that your car was running at around 180 rpms, astonishing. You sure you meant you checked after startup or during startup?

[Jeremy-WI]

Originally Posted by ctwright

I answered a minute ago then deleted after I realized I had a major brain fart. I'm not sure how many rpms you were turning when getting the spark every three seconds or so.

If you were turning 1300 rpms that is almost 22 revolutions per second.
That means that each individual plug should fire 22 times in a second. Look very closely and try to count you should be able to tell. Did you check each individual wire separately? Because if so and they all are 3 seconds apart that means that your car was running at around 180 rpms, astonishing. You sure you meant you checked after startup or during startup?

A plug only fires every other revolution of the crankshaft, 1-8-4-3 on one revolution and 6-5-7-2 and the other revolution

[ctwright]

Originally Posted by Jeremy-WI

A plug only fires every other revolution of the crankshaft, 1-8-4-3 on one revolution and 6-5-7-2 and the other revolution

Your right I goofed, excuse me then(wasn't as bad as my first brain fart you should have seen that one), in my example it would have been 11 times a second. And his motor would be turning at 360 rpms. Thanks for correcting me.

[jyount]

Originally Posted by Jeremy-WI

Is there some play in your distributor(side to side)? You could also have a worn distributor gear. Cam retard is the difference the PCM detects between pulses from the crankshaft position sensor and the cam position sensor(in the distributor) and it helps to set the distributor correctly after removal. The cmp code may indicate a worn distributor housing

He just replaced it, but if you replaced it and the code came back. Two things come to mind. Either the distributor is junk, aftermarket new ones often are, or you have an electrical issue between the distributor and the pcm. Well three, none of us are perfect, maybe you put the distributor in a tooth or two off.

[ctwright]

Originally Posted by ctwright

Your right I goofed, excuse me then(wasn't as bad as my first brain fart you should have seen that one), in my example it would have been 11 times a second. And his motor would be turning at 360 rpms. Thanks for correcting me.

Ok no more math for me today I was wrong again. I calculated what I thought his would be by first doing 3 times 60 which gave 180. Another guy corrected me I wasn't thinking about the fact that each plug sparks once every 2 turns of the crankshaft at the end of the compression stroke.

Well, I then went back and calculated it at 120 times 3, came up with 360. Well, I was still wrong because I calculated it as if he said he was getting 3 sparks per second instead of a spark every 3 seconds. So I then went back and calculated it 1/3 (amount of spark per second) times 120(60 seconds times 2 for 2 turns per spark) and it is about 40 revolutions per minute. I just edited that I might still be wrong, lol.

So thanks to the guy who corrected me the first time. If you are getting spark to each of your plugs every 3 seconds your motor would be turning at around 40 rpms.

Which brings me back to the point I was trying to make, how did you check your spark when you was getting 1 spark every 3 seconds?

[ctwright]

Just wanted to come back and reword the way I did that formula because it didn't make much sense the way I had it. Either way you will get the same answer though.

Spark/second * 2 = Revolutions/second (thanks again for the person who corrected me on that)

Revolutions/second * 60 = Revolutions/minute

So in that case according to the guy it was 1/3rd of a spark/second

.33 * 2 = .66

.66 * 60 = 39.6

So RPMs = 39.6 in that case.

[1996pmt]

well well the trusted mechanic did not have the distributor set. im sorry he had it set to about #7! go buy another set of plugs and that problem should be fixed. still have the jerk think it may be the new maf though because it reads 0.0 on the scan tool and the code keeps coming back. thanks to all for their input.