94 running rough with a twist

[astromark]

Yes, no change. Pulled #2 wire no change. I removed the valve cover to see if rockers moving like the rest, they appear to be. I would need to get a depth guage from work monday to check full travel though.

[old_master]

Everything you’re coming up with indicates #2 is running lean. Several things can cause only one cylinder to run lean: An intake manifold gasket leak on the underside, a restricted or stuck poppet, or a mechanical problem with a valve, camshaft, or valve lifter. A compression and cylinder leakage test would determine if the problem is mechanical or not. The most common would be a stuck or restricted poppet. At this point, the easiest and least expensive thing to try would be to add some serious injector cleaner to the fuel tank, cross your fingers and hope the poppet starts working again.

[astromark]

WOO HOO. Old Master you are the man. I pulled the upper intake (gasket is new) and #2 did not spray at all, #4 and 6 did so I messed with it gently (carb cleaner, Jewelers screwdriver) and it worked. Closed it up and she runs awesome, a test drive was also impresive.

Thank you very much.

I guess it goes to show, take a step back and start from the beginning. One step at a time and have patience. Be sure you have what you need to get the end result and don't jump to conclusions. My autoshop teacher taught me that many years ago. I guess I should have done that from the begining.

Live and learn, learn something new every day.

Thank you again.

[old_master]

Originally Posted by astromark

...I guess it goes to show, take a step back and start from the beginning. One step at a time and have patience. Be sure you have what you need to get the end result and don't jump to conclusions. My autoshop teacher taught me that many years ago. I guess I should have done that from the begining...

Words to live by in the world of automotive diagnostics.

Glad you got her going, good job! What did you find with the poppet? Crud, or just stuck?

[astromark]

I'm not exactly sure but my guess is the injector cleaner moved some crud into it. When I was spraying the carb cleaner in it looked a bit dirty dripping down. I relieved the pressure with the screwdriver at the test port and forced the carb cleaner into the poppet. Maybe I was lucky. Does the spring force the ball towards the injector or to the intake? I did push on it a little.The spider is not even 4 years old.

I went for an inspection today and I had to fix a front end part and a bulb. Back again tomorrow. The mechanic also said it was running very good.

Then another thread for an electrical problem I have been dealing with for years.

[old_master]

When the injector coil energizes, the fuel pressure overcomes the spring tension in the poppet valve. This forces the ball from its seat which injects the fuel on to the back side of the intake valve. When the injector coil de-energizes, the poppet valve spring forces the ball against the seat shutting off the fuel at the poppet nozzle. System pressure is critical: If the pressure drops below the minimum, the poppet ball will not receive adequate pressure to overcome the spring tension.

[astromark]

Ok, got that now. Why is the spark so crazy with the inductive pickup on the timing light? I also saw it on 3rd try for sticker ( 2nd day carbon in egr, 3rd rpm not registering properly, 4th no one qualified in garage next door, 5th lots of oil smoke but passed with flying colors). It only happens after it is driven then cools down a little and restarted. There is still water and gas in the oil and needs several more changes to clear it out ( oil cooler). I hope thats why. I also replaced valve seals.

Thank you again old_master, It runs better than it ever has.

[JOEYD0730]

Great post, i have a questions. i own a 94 safari vin w. i cant seem to get the timing set either. it runs good, no big misses.. on the balancer there are two notches.. which one do i mark? also pretty hard to get the light donw there. can someone describe the easiest way and correct way to set the timing on this vehicle. i did unplug the connector at the coil. thanks for any help, joe

[longlacryan]

change the pick upcoil in the distributor
they are not expensive