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Performance Upgrades - Maintenance - Modifications - Problem Solving - Off-Road - Street Trucks. Covering the Explorer, ST, Sport, Lincoln Aviator, Sport Trac, Mercury Mountaineer, Mazda Navajo, Ford Ranger, Mazda Pickups, and the Aerostar. Featuring H.I. - Human Intelligence.
My 99 AWD 5.0 Merc is shaking at low RPM, feels like a misfire. It isn't consistent, it goes away once you start going, and it runs like a top otherwise. 82k miles.
Suggestions?
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My friend is a mechanic and owns his own shop. He has a scope that connects to the EDIS and measures spark voltage, current, and displays discrepancies in spark energy between cylinders. Very invaluable tool, so that would be a good start if you have access to it.
Otherwise, the common issues I've seen with EDIS are that the coil packs can lose their ground path via corrosion around their base at the mounting bracket, so cleaning that up can help a lot. I ended up fabricating a ground strap to get around that issue. However, coil packs need replacement from time to time too - I have Accel EDIS coil packs and have been quite happy with them.
edit: Also make sure you're 4R70W TCC clutch isn't causing the shuddering, that's caused by old fluid or a really worn out clutch inside the TC.
If you've got a bad ground with the EDIS coil packs, and/or the filter cap isn't grounded properly, I think you will see a random misfires on random cylinders. If you're issue is isolated to #8 specifically, I would start looking at the wiring. It's possible that a critter could've chewed on something, or perhaps the check the fuel pressure, etc.
Yeah, the filter capacitors. There should be 2 of them, one for each EDIS coil pack. Each cap receives 12V with the key on and the other end of it grounds to one of the corners on the coil pack (obviously metal). You can check to see if the ground path is sufficient by using a multimeter, in fact. You should measure the resistance between the grounding point for your filter caps and the negative terminal of the battery. If there's resistance, even 1-2 ohms, you need to make a better ground for the caps. It might be as simple as cleaning the coil packs and the mounting bracket, but I fashioned new ground straps from scratch.
By any chance can you locate them in a pic? I believe I have one. I always assumed they had something to do with blocking radio interference. I don't believe I saw two but I could be looking in the wrong place.
By any chance can you locate them in a pic? I believe I have one. I always assumed they had something to do with blocking radio interference. I don't believe I saw two but I could be looking in the wrong place.
When my car first started acting up, I would get a code and more misfiring after a few days. I would try something such as new plugs, clear the codes, and the symptoms and codes would pop up a few days later. The codes were misfire on #8 and lean condition on bank 2.
After putting my injector in, I quickly got a CEL and it now blinks. I haven't ran codes yet, but blinking=impending cat damage from what I read. Cats usually get damaged on rich conditions. Very strange.
Much to my dismay... The codes now read cylinder 1 misfire and bank 1 lean. I think it's a fuel issue because if it were not firing it would be rich. Arrgh!
