Question about 1998 Honda Accord

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Intermintant nonstarting I can drive the car for days and then I can try to start the car and it just turns over and won't go. I have checked the spark and that is good. It looks like the fuel because while cranking the engine there is no pressure in the fuel line. But after a while (20 minutes to 2 hours) it will finally start and then it will run perfectly. There are no issues on the computer; it say all systems are a go.

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If my memory i correct you have a fuel pump in the tank to a low pressure line that goes to the injection pump.  Beware, if this is your setup, the fuel rail after the injection pump carries high pressure fuel (around 100 PSI), so be very careful here.  

Since you have checked spark and suspect fuel, get a haynes manual for about $20 (parts store, amazon, haynes.com) and go through thier diagnosis/trouble shooting for fuel system.  Since you understand basis diagnosis, this manual will fast track you on how to best test your exact setup, by people that have taken it apart.

The following info is how I think that system works on a late 90's accord, but they will tell you exactly and concisely ... and save you hours of time.
The fuel pump in the tank probably has a check valve that holds fuel in the low presure line to the injection pump, so that gravity/syphon doesn't pull fuel back into the tank.  These check valves can go bad or get foreign matter in them and intermittently get stuck open.  Before the engine starts, the pump in the tank may get turned on, but frequently this is on a short timer.  If the valve didn't keep fuel in the loine, the timer will run out before the fuel gets pushed back up to the injection pump.  When you turn the key to the on position, listen for a quiet little motor whirring ... if it's there it will probably only be on for a few seconds, then stop,  If this is the case you can attempt to get pressure to the injection pump by turning the key on, then when the pump stops, turn off ... and repeat this 3-4 times. With luck after a few times you won't hear the pump come on ... and it will now start.

This is all based on a 98 Passport (Honda badged Izuzu), but many cars have this setup.  The dealer told be a number of things injectors bad/dirty, wrong spark plug#$@%! but never checked pressure on the fuel rail.   When things are working right, the high pressure fuel rail should hold close to the 100 PSI or so operating pressure indefinately.  This is easily tested by a mechanic by pluggin a pressure guage into the high pressure side, and going back after an hour to see if the pressure held or is dropping;

good luck












is worth about $3-4, but that you cannot get

Posted on Oct 31, 2008

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