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strikeeeer
User
Jul 13, 2011, 8:38 AM
Post #1 of 9
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loose spark 10 seconds
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1998 gmc serria 1500 5.7 It starts when cold but runs 10-15 seconds and looses spark.I replaced coil,ing. mod. ,camshaft sen. ,6 months ago crankshaft sen.grounds to firewalland engine to frame.When spark gone have 10.9 volts to coil.Thanks for and help.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 13, 2011, 11:02 AM
Post #2 of 9
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Re: loose spark 10 seconds
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Try unplugging the oil pressure sender
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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strikeeeer
User
Jul 14, 2011, 6:48 AM
Post #3 of 9
(1368 views)
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Re: loose spark 10 seconds
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I unplugged it it stsrts but will not stay running ,it also after starting a couple times starts like my timing is off.But it starts each time I try.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 14, 2011, 7:00 AM
Post #4 of 9
(1366 views)
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Re: loose spark 10 seconds
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Have you tested the charging system voltage?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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strikeeeer
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Jul 14, 2011, 11:29 AM
Post #5 of 9
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Re: loose spark 10 seconds
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Took alt. in check fine.Going to take new ing.mod in and have checked.Starts each time but runs 10 15 seconds and quits.Have 62lbs at rail.Battery only at 60% charge.
They could not check, they tried but new and old failed .Thanks for your input Hammertime
(This post was edited by strikeeeer on Jul 14, 2011, 10:17 PM)
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strikeeeer
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Jul 15, 2011, 9:57 PM
Post #6 of 9
(1330 views)
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Re: loose spark 10 seconds
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Dont know what I did but took ing.mod ,camshaft sen. to have check they could not check .Put everything back together,oil sen. back on and it started right up and seems to be running fine.Again Thanks Hammertime.Sorry for response.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 16, 2011, 3:23 AM
Post #7 of 9
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Re: loose spark 10 seconds
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Must have been something you handled. Let's see what happens now.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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strikeeeer
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Jul 17, 2011, 8:20 PM
Post #8 of 9
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Re: loose spark 10 seconds
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Well it did not work.Now it runs about 5-6 miles then it starts to run with a feeling like it is pulsating then just stops.Cools down starts back up.Once it stops does not start till it cools down.Help!!!!!!!!!!!!!!
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 18, 2011, 2:54 AM
Post #9 of 9
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Re: loose spark 10 seconds
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All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.
Every engine requires spark, fuel and compression to run. That's what we have to look for.
These are the basics that need to be tested and will give us the info required to isolate a cause.
1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.
2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.
3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.
4) If all of these things check good, then you would need to do a complete compression test.
Once you have determined which of these functions has dropped out,
you will know which system is having the problem.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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