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1999 Chevy Express Van, mileage 130000. Had been have a starting problem for sometime where it wouldn’t start on the first try...it would take at least three or four times before it would start. This problem would occur only on the first start in the morning after been sitting overnight. It started find every time during normal use during the day. If the vehicle sat longer for two days it would take even longer to start. Well, what ever the problem it finally failed completely because now it will not start at all. The fuel pump was replaced about a year ago and you can hear it running when you turn on the ignition. Service Engine Soon light has been on for about a year with the following OBD-II CODES:
P0452 Evaporative Emission Control System Pressure Sensor Low Input (replaced the gas tank cap but did not clear this error)
P0430 Catalyst System Efficiency Below Threshold (Bank 2)
Hi, got a replacement pump on 99 express, punp only, when i plug in to an outside 12vlt pump runs, when i plug into theharness the ptheres no energy at all,disconnect and check the harness on start it does what the book saysit should do,plug the pmp into the harness and again theres no juice even bypassed th plg on top of the cage and no juice, my question is does this pump itself have a fuel sensor?
What you're describing sounds an awful lot like a collapsed catalytic converter.
Open up the exhaust right before the cat(s) if possible and try to start the engine. If the engine starts, then the catalytic converter(s) need to be replaced.
With due respect, I suspect a fuel problem. When cranking it acts like it wants to start (would seem to eliminate a no spark issue. Even though I can hear the fuel pump buzzing when the ignition is turned on there seems to be little fuel pressure when depressing the fuel valve stem (fuel leaks out but does not squirt with pressure).
It turned out to be a fuel pressure problem as I suspected. Thanks, to Joe, I tried his suggestion to someone else with a similar problem to do a quick test by jump starting vehicle (used my battery charger). It started up right away. I will probably end up replacing the fuel pump though. As explained, due to a weak fuel pump and a weak battery it doesn't build up enough fuel pressure to start. The reason it starts normally on first try during the rest of the day is because the fuel pressure is holding enough to start but leaks out overnight due to a bad check valve in the fuel pump.
Still have the error codes to fix which I didn't think had anything to do with why it didn't start (they've been on for sometime before I had the starting problem).
If you have fuel pressure it's most likely not your fuel pump. Check to see if you have a check engine code with a obdii scan tool. Harbor Freight has one for $40 (cheapest around and it comes in handy all the time, I got mine on sale for $30). For some reason the check engine light doesn't come on for some of the codes that get tripped. Most likely it's your crank position sensor, at least mine was. Cheapest I found was at AutoZone for $55 (with 2 year warranty, instead of a year with the oem version) If you have any questions just email me. The sensor took me 5 minutes to change and it's very easy to do. Good luck.
email Fred
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