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Does not start

Tiny
KEVIN GODWIN
  • MEMBER
  • 1998 MAZDA B2500
  • 175,000 MILES
Has fire has injector pulse has air has fuel has fuel pressure timing is on has compression does not start no codes no security fault
Friday, December 23rd, 2011 AT 3:02 AM

21 Replies

Tiny
KEVIN GODWIN
  • MEMBER
  • 53 POSTS
Done all the above (basics) still nothing even tried a used computer like stated in post above has fire has injector pulse has fuel pressure and timing is dead on. No codes or security faults
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Friday, December 23rd, 2011 AT 3:21 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
How did you check the timing that is dead on-also what is the fuel pressure?
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Friday, December 23rd, 2011 AT 3:24 AM
Tiny
KEVIN GODWIN
  • MEMBER
  • 53 POSTS
Pulled the timing cover off and checked cam and crank marks
fuel pressure 35psi
injector pule and pulse width looks great as well
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Friday, December 23rd, 2011 AT 3:28 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Are you so sure its on the compression stroke instead of being in the exhaust stroke-180 deg off-
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Friday, December 23rd, 2011 AT 3:31 AM
Tiny
KEVIN GODWIN
  • MEMBER
  • 53 POSTS
Yes and truck has cranked and ran perfect once since problem did not recrank rechecked everything though still found nothing wrong all numbers look good all sensors read good all waveforms are good
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Friday, December 23rd, 2011 AT 3:35 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
You got compression, fuel and spark it should be able to combust I can't think of anyting else
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Friday, December 23rd, 2011 AT 3:55 AM
Tiny
KEVIN GODWIN
  • MEMBER
  • 53 POSTS
Thats what I thought too but
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Friday, December 23rd, 2011 AT 4:00 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Something is still amiss between the 3 elements
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Friday, December 23rd, 2011 AT 4:04 AM
Tiny
KEVIN GODWIN
  • MEMBER
  • 53 POSTS
I agree but I can hook a compression gauge and fuel pressure gauge a noid light and a spark tester all at the same time and everything is there even tried and egr valve thinking maybe its stuck open letting to much (used) air into combustion chamber to run.
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Friday, December 23rd, 2011 AT 4:09 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
EGR valve could be wide open creating a massive vacuum leak
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Friday, December 23rd, 2011 AT 4:56 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Are the sparks strong?
Weak saprks can result in non starting.
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Friday, December 23rd, 2011 AT 12:35 PM
Tiny
KEVIN GODWIN
  • MEMBER
  • 53 POSTS
Spark looks a little weak maybe but it has no reason to be weak and it still should run. Plugs wires coils are new
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Saturday, December 24th, 2011 AT 2:28 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
What's the fuel pressure reading?
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Saturday, December 24th, 2011 AT 2:41 AM
Tiny
KEVIN GODWIN
  • MEMBER
  • 53 POSTS
35 psi
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Saturday, December 24th, 2011 AT 2:45 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
A failing coil would result in weak sparks and continued starting would flood the cylinders causing the spark plugs to be wet and cause non-starting.
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Saturday, December 24th, 2011 AT 11:27 AM
Tiny
KEVIN GODWIN
  • MEMBER
  • 53 POSTS
Coils have been changed same spark
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-1
Saturday, December 24th, 2011 AT 11:55 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
What is the compression pressure for each cylinder?
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Saturday, December 24th, 2011 AT 1:11 PM
Tiny
KEVIN GODWIN
  • MEMBER
  • 53 POSTS
Got it cranked with new computer but will only crank at WOT then once cranked runs fine just has a stumble when first tipping into throttle
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Friday, January 6th, 2012 AT 3:17 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Stumbling during initial throttle opening could be due to

1. Sparks misfiring.
2. Fuel injectors operations.
3. Fuel pressure.
4. Valve clearances too tight.
5. TPS out of adjustment

Since vehicle had not been started for quite some time, let it have some running time to see if the problem evens out.

Starting only with WOT can mean a fault with the TPS or its adjustment.

Check to see if there are ant trouble codes.
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Friday, January 6th, 2012 AT 10:26 AM
Tiny
KEVIN GODWIN
  • MEMBER
  • 53 POSTS
Fixed no it was a crack in the head would only leak while truck was off once fired it would burn the small amount of antifreeze then seal up and run fine until you let it sit again
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Friday, March 30th, 2012 AT 2:39 PM

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