98 Safari still not starting. Possible fuel issue???

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motoboy5207
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98 Safari still not starting. Possible fuel issue???

Post by motoboy5207 »

Ok I am getting 60 psi of fuel pressure at schrader valve and it holds. Is it possible to have enough pressure but not enough volume to allow it not to start?
Originally this thing was not even sputtering or trying to start. I have been all over, no codes of importance. New distributor, cap and rotor. Appears to be good nice blue spark at plugs. New crank position sensor and even drained my fuel tank suspecting bad fuel. After all that it will try to start and then nothing. I have bled new fuel up to the rail and all it does is seem to want to start and then nothing just crank. I hate to think it might be a injection spider issue or timing chain jumped or somthing like that?
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Re: 98 Safari still not starting. Possible fuel issue???

Post by MountainManJoe »

It could very well be the spider. Hopefully you can just individually apply 12V to the poppet valves to see if they work.

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Re: 98 Safari still not starting. Possible fuel issue???

Post by LiftedAWDAstro »

If it holds 60 psi at the rail, you have enough volume. I don't have anything else for you from my end. Seems you have checked everything I would.
Current rides:
2013 Toyota Tundra DC 4x4
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Vans owned:
1986 Safari 2.5L 4 speed manual - scrapped
1995 Astro 2WD conversion 4.11 posi, shift kit, DHC rock rails - sold to Skippy
1998 Astro 4x4 D44, D60, NP231, full hydraulic system with 9k# Milemarker winch and snow plow - sold to Lockdoc
2003 Astro AWD all stock - traded for a 3/4 ton truck
2005 AWD, 4.10's - sold to skippy
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Re: 98 Safari still not starting. Possible fuel issue???

Post by doyoulikeithere »

fuel in the rail, at pressure, no fuel in the combustion chamber - sounds like the injectors are not injecting.
Have you checked to see if voltage is being supplied to the injectors, and also if they have a good enough ground to complete a circut, so that they will inject?
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Topic author
motoboy5207
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Re: 98 Safari still not starting. Possible fuel issue???

Post by motoboy5207 »

Going to check out injection system tomorrow. After all I have done it appears that my plugs are dry after start attempts. So it could very well be that. I did verify timing is correct.
Thank you

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motoboy5207
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98 Safari still not starting. Possible fuel issue??? Cont..

Post by motoboy5207 »

Ok so my fuel pressure does not hold, how quick should it blled down and how much? When ignition is turned pressure will jump to 60 psi and after pump shuts off the pressure fall about 4 psi. In fifteen minutes pressure will fall approx. 30 psi. Could this be what is causing my starting issue?

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Re: 98 Safari still not starting. Possible fuel issue??? Con

Post by 2002Safari »

Take a look at http://troubleshootmyvehicle.com/gm/4.3 ... uel-pump-1

From what I understand you need in the mid-50's psi to fire.

Also http://troubleshootmyvehicle.com/gm/4.3 ... se-study-1

This range of articles are taken from http://troubleshootmyvehicle.com/gm/4.3 ... articles-1

Hope this is of some level of help

Roy
2002 Safari SLT

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Re: 98 Safari still not starting. Possible fuel issue??? Con

Post by LiftedAWDAstro »

Falling pressure doesn't necessarily mean anything. All you really want is to have about 52 psi while cranking the engine over to start. If it gets below 50 psi, there is a good chance the pump is bad.

Falling pressure means 1 of 3 things: 1. the check valve in the pump is bad and it is draining back to tank, 2. there is an external leak where you would see the gas on the ground, 3 there is a leaking injector in which it would act like it's flooding.
Current rides:
2013 Toyota Tundra DC 4x4
2008 Dodge Nitro 4x4
2005 Nissan Sentra 1.8S Special Edition

Mileage spreadsheet

Vans owned:
1986 Safari 2.5L 4 speed manual - scrapped
1995 Astro 2WD conversion 4.11 posi, shift kit, DHC rock rails - sold to Skippy
1998 Astro 4x4 D44, D60, NP231, full hydraulic system with 9k# Milemarker winch and snow plow - sold to Lockdoc
2003 Astro AWD all stock - traded for a 3/4 ton truck
2005 AWD, 4.10's - sold to skippy

Topic author
motoboy5207
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Re: 98 Safari still not starting. Possible fuel issue??? Con

Post by motoboy5207 »

Ok so here's what I have determined. It will maintain above 60 psi and fluctuate 2-4 psi while cranking. So I am to assume fuel pump is good and injection spider should be good? It will not fire over while spraying carb cleaner into throttle body. I have spark but I wonder if coil is weak. How far should the spark from coli lead be able to jump to a good ground?

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Re: 98 Safari still not starting. Possible fuel issue??? Con

Post by LiftedAWDAstro »

Your fuel pressure is good. That is good news! Since you spray carb cleaner into it and it still doesn't fire, I would say you have very weak spark. If the cap and rotor contacts are clean and the coil to distributor cap is good and not grounding out on the tranny dipstick tube, I would suspect a coil or ignition module.
Current rides:
2013 Toyota Tundra DC 4x4
2008 Dodge Nitro 4x4
2005 Nissan Sentra 1.8S Special Edition

Mileage spreadsheet

Vans owned:
1986 Safari 2.5L 4 speed manual - scrapped
1995 Astro 2WD conversion 4.11 posi, shift kit, DHC rock rails - sold to Skippy
1998 Astro 4x4 D44, D60, NP231, full hydraulic system with 9k# Milemarker winch and snow plow - sold to Lockdoc
2003 Astro AWD all stock - traded for a 3/4 ton truck
2005 AWD, 4.10's - sold to skippy

Topic author
motoboy5207
I am merely driving my van
I am merely driving my van
Posts: 9
Joined: Wed Mar 27, 2013 6:05 am

Re: 98 Safari still not starting. Possible fuel issue???

Post by motoboy5207 »

Trying that tomorrow, have a buddy that just lent me two coil assys with the module. Fingers crossed.
Thanks

Topic author
motoboy5207
I am merely driving my van
I am merely driving my van
Posts: 9
Joined: Wed Mar 27, 2013 6:05 am

Re: 98 Safari still not starting. Possible fuel issue???

Post by motoboy5207 »

Well I figured it out. Installed another coil and she fired up first turn of the key. Thanks to all that posted.

LiftedAWDAstro
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Re: 98 Safari still not starting. Possible fuel issue???

Post by LiftedAWDAstro »

Glad you got it! :bounce:
Current rides:
2013 Toyota Tundra DC 4x4
2008 Dodge Nitro 4x4
2005 Nissan Sentra 1.8S Special Edition

Mileage spreadsheet

Vans owned:
1986 Safari 2.5L 4 speed manual - scrapped
1995 Astro 2WD conversion 4.11 posi, shift kit, DHC rock rails - sold to Skippy
1998 Astro 4x4 D44, D60, NP231, full hydraulic system with 9k# Milemarker winch and snow plow - sold to Lockdoc
2003 Astro AWD all stock - traded for a 3/4 ton truck
2005 AWD, 4.10's - sold to skippy
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