J
Jack B
Guest
OK, this truck has had some weird ignition problem for months now and it renders the truck effectively undrivable. After it's warm, it does this thing where it jerks under acceleration/load. It seems like a simple misfire at first, but after a minute it starts to jerk hard, and I mean HARD. Practically back and forth. It's a 1995 with the 3.4L V6 engine and manual trans. Here's the weird thing: I haven’t been able to drive the truck out of my neighborhood since this problem started months and months ago. But last Saturday I drove it around some and it did fine, so I tried to drive it to my uncle’s house about 40 minutes away and it made it the whole way with only a bit of a misfire after I’d been driving for half an hour. It drove around fine all day; not perfect but WAY better. But the next day, it was just as bad as ever. Every day since, too. Another weird thing: If it starts having the problem, I can just put the clutch in and restart the truck and it usually does fine for a few more minutes. My uncle was a mechanic for a long time, and knows his stuff; he’s even familiar with this engine, but this problem has us all stumped. I’ve changed the spark plugs and wires and Ohmed out the coil packs (they checked out fine). I even checked the MAF sensor. On Tuesday the truck threw a CEL code for ‘fuel trim malfunction on bank 1’. Is it probably the ECM? A sensor feeding the ECM? I’m running out of ideas.
There's no distributor. Should have mentioned that it's a distributorless ignition. If it was a regular old distributor system this problem probably would have been solved months ago.
There's no distributor. Should have mentioned that it's a distributorless ignition. If it was a regular old distributor system this problem probably would have been solved months ago.