1995 T/A

My car developed a couple of problems over time, the two most noticeable were the occasional miss in wet conditions and backfire under load (flooring it in high gear up a steep grade) I attributed the backfire to a leaking collector gasket. Now it takes a noticeably longer amount of time to fire off than it used to. About 3 to 5 seconds. Fuel pressure is dead on (hadn't ran it in a while so I made sure I didn't have leaky injectors) fuel pressure primes to 50 psi idles 43 and is around 48 psi with the vacuum disconnected. Any ideas as to what I should check next for the longer cranking intervals?

myltwon

iTrader: (1)

Could be a weak or dying icm/coil

1995 T/A

Thought that too. It runs great other than a long start up. I'll try and check them tomorrow.

bufmatmuslepants

iTrader: (3)

Running crappy in wet weather could be bad plug wires, arcing when water is present to help the spark find a different path than through the spark plug. That's what mine was when I had the same problems. Specifically the coil wire.

1995 T/A

Yeah I figure that there are a couple of problems like that. It doesn't run rough every time in the wet; it just most recently, consistently spins over much longer than it used to no matter the condition outside.

BALLSS

did you pull the coil wire and look inside the boot and Opti for corrosion?

misfire under load is often plug wire arc. can be hard to see in dark so look carefully...even under car while it is running. if you have the heat shields over boot ends the arc can be between it and boot and VERY hard to see

smgseanmicheal

I just spent four months chasing a problem in my 95 replaced the coil opti plugs fuel filter and 02 got rid of my cat because it clogged still had a shake in 5-6 gear, and at low rpms if you've never done plug wires they were my problem but may not be yours just saying though just because wires look ok doesn't mean they are

1995 T/A

I'll check them out, I think the backfire was caused by a leaking collector gasket, runs great. It still has to be spun over for about 5 seconds before it starts. It does it every single time, no knock retard, blms are 128, timing advance is around 25 degrees running. I can prime it and it makes no difference, I have an adjustable fuel pressure set dead on spec. It leads me to believe the problem is in the ignition.

1995 T/A

Finally got around to checking the coil with a spark tester. It fires as soon as I turn the key. So I guess I'm looking at a bad check ball in the pump. With the key on the pump primes and turns off while spinning over as soon as it hits the pump turns back on and it's running.

1995 T/A

Replaced fuel pump with a Walbro 255 that I had. Start up problem is still there. I'll check the pulse on the injectors tomorrow.