it'll crank, but no fire

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  #1  
Old 09-20-07, 08:59 PM
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it'll crank, but no fire

I've got a 1987 Buick Century 2.5 litre 4cyl that will not start. I've replace the crank position sensor, control module, plugs and wires, and still get nothing. The car was at a dealer prior to my getting it and they said that all it needed was the crank sensor. I've got fuel going TO the injector, but not THROUGH it, so fuel pump is operational. I can pull the number 1 spark plug and check for spark, but get none. Of all of the people that I've talked to about this problem, we all seem to come to the same conclusion--main computer. I just wanted to get some other input from everyone out there.
Thanks.
 
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  #2  
Old 09-21-07, 03:16 PM
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If you got fuel going too the rail, then it maybe the fuel pressure regulator, have you checked that?
 
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Old 09-21-07, 04:45 PM
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What I find interesting about your post is the fact that currently you have no fuel and no spark; sort of.

Your car is not going into shutdown, I don't think (some cars have this feature that shuts off the fuel AND spark). That wouldn't appear to be your case, because even though you are not getting fuel through the injector, the fuel pump is still working. I don't think that would even happen if you were in any kind of 'shutdown' mode, causing a no gas/no spark condition..

So now that makes me wonder about the spark. It sure seems odd that if you are NOT in shutdown mode, that you would just so happen to not be getting fuel through the injector and no spark, at the same time. So I'm wondering if you are absolutely positive on each of your assessments.

How did you go about determining you are getting the (proper amount/pressure and volume) of fuel to the injector? And how did you go about testing to see if you have spark? And are the people who advised about the computer, professionals?
 
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Old 09-21-07, 08:29 PM
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I've checked for spark by pulling the #1 spark plug out of the head, re-attaching the wire and having an assistant crank the engine..result, no spark. As for the fuel problem, I have not checked the fuel pressure at all with gauge but rather pulled the injector out of its housing and, again, had an assistant crank the engine..result, fuel spray everywhere. To me this indicates the lines are not clogged in any way, but, seeing as the car is 20 years old, the fuel filter probably needs changing. With regards to whom I've contacted about the computer, they are former co-workers of mine at the parts store. One of them used to work directly with Ford Motor Company, so I trust his advice, although the car in question is a GM.

Thanks again for any input.
 
  #5  
Old 09-22-07, 04:25 PM
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Originally Posted by Heidelburg View Post
I've checked for spark by pulling the #1 spark plug out of the head, re-attaching the wire and having an assistant crank the engine..result, no spark.
Thanks again for any input.
And thank YOU for responding to every point asked.

But I still do not follow your spark test. How would you see a spark by reattaching the wire?

And I was kind of thinking the rest of the cavalry might jump in here too to help out as you have an interesting mystery here, IMO, especially if you really DO NOT have spark, and the fuel suddenly at the same time stopped going through the injector (yet the electric pump did not go into shutdown) at the same time).
 
  #6  
Old 09-22-07, 06:00 PM
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generally no spark or no injector pulse is usually related to module or crank sensor but seeing how youve already replaced those items you should probably check some other things like power and ground to the module? does the check engine light come on when the ignition is in the on position? does it flash code 12 if the aldl connector under the dash pins a and b is jumpered?
cant say ive ever seen the computer cause a no spark but it can cause no injector pulse but you should still have spark you should check for spark on a couple of cylinders if youve checked cyilinder no 1 check on cyl 2 0r 3 to see if there is spark on any of them as a bad coil could cause loss of spark to two cylinders. taking a guess would be you may have gotten a faulty part or are missing power or ground to the module.
 
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