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
Dec 23, 2011 at 3:02 AM
does not start
1998 MAZDA B2500
KEVIN GODWIN
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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
Dec 23, 2011 at 3:21 AM
How did you check the timing that is dead on-also what is the fuel pressure?
Dec 23, 2011 at 3:24 AM
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pulled the timing cover off and checked cam and crank marks
fuel pressure 35psi
injector pule and pulse width looks great as well
fuel pressure 35psi
injector pule and pulse width looks great as well
Dec 23, 2011 at 3:28 AM
Are you so sure its on the compression stroke instead of being in the exhaust stroke-180 deg off-
Dec 23, 2011 at 3:31 AM
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
Dec 23, 2011 at 3:35 AM
You got compression, fuel and spark it should be able to combust I can't think of anyting else
Dec 23, 2011 at 3:55 AM
thats what i thought too but
Dec 23, 2011 at 4:00 AM
Something is still amiss between the 3 elements
Dec 23, 2011 at 4:04 AM
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......
Dec 23, 2011 at 4:09 AM
EGR valve could be wide open creating a massive vacuum leak
Dec 23, 2011 at 4:56 AM
Are the sparks strong?
Weak saprks can result in non starting.
Weak saprks can result in non starting.
Dec 23, 2011 at 12:35 PM
spark looks a little weak maybe but it has no reason to be weak and it still should run. plugs wires coils are new
Dec 24, 2011 at 2:28 AM
What's the fuel pressure reading?
Dec 24, 2011 at 2:41 AM
35 psi
Dec 24, 2011 at 2:45 AM
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.
Dec 24, 2011 at 11:27 AM
Coils have been changed same spark
Dec 24, 2011 at 11:55 AM
What is the compression pressure for each cylinder?
Dec 24, 2011 at 1:11 PM
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
Jan 6, 2012 at 3:17 AM
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.
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.
Jan 6, 2012 at 10:26 AM
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
Mar 30, 2012 at 2:39 PM
Glad to know you have fixed the problem. Thanks for the input.
Have a nice day.
Have a nice day.
Mar 30, 2012 at 5:09 PM