Help Please! I have 97 lx450, it was running rough and under powered so I changed the plugs, cap, rotor, pvc valve, air and fuel filters and adjusted the timing. When adjusting the timing I noticed the timing light would jump, it was good for a maybe ten lights then it would skip one then some good lights then skip another and so on. Figured it was my old timing gun.
A few thousand miles later I noticed it was misfiring, OBDII scanner said P0304. So I check the leads and #4 was about 8X max resistance, the rest were good. I changed the #4 lead and it started smooth in my driveway, I hopped in and went for a test drive. I started slow and everything seemed fine, about a mile down the road I decided to open it up, soon as I pressed the pedal the truck died and I couldn't get it started so I towed it home. BTW, it was raining hard when it died.
Here's the strange part, when I turn it over in my garage, it starts for a second and dies as if something is killing the engine, and it does so sounding like it's gasping for air. So I checked and double checked the obvious but could not find the problem. I actually got it started twice, the first time it idled OK but when I pressed on the gas it rumble badly so I shut it off. The second time I got it started it idled very rough and white smoke was coming out of the tail pipe so I shut it down right away.
Here's what I checked, the CEL comes on and I can smell gas, so I am thinking that the EFI is OK but I am not sure. I get a spark at the end of the lead grounded so it seems like the ignition is ok, but again not sure. I also checked compression, from 1-6, 154, 148, 132, 178, 154, 148. The two in the middle are kind of strange, could that be a bad head gasket? Would that cause the engine to shut down? Any other ideas? Could the coil, distribtor or ignitor work for a couple of seconds then die?
A few thousand miles later I noticed it was misfiring, OBDII scanner said P0304. So I check the leads and #4 was about 8X max resistance, the rest were good. I changed the #4 lead and it started smooth in my driveway, I hopped in and went for a test drive. I started slow and everything seemed fine, about a mile down the road I decided to open it up, soon as I pressed the pedal the truck died and I couldn't get it started so I towed it home. BTW, it was raining hard when it died.
Here's the strange part, when I turn it over in my garage, it starts for a second and dies as if something is killing the engine, and it does so sounding like it's gasping for air. So I checked and double checked the obvious but could not find the problem. I actually got it started twice, the first time it idled OK but when I pressed on the gas it rumble badly so I shut it off. The second time I got it started it idled very rough and white smoke was coming out of the tail pipe so I shut it down right away.
Here's what I checked, the CEL comes on and I can smell gas, so I am thinking that the EFI is OK but I am not sure. I get a spark at the end of the lead grounded so it seems like the ignition is ok, but again not sure. I also checked compression, from 1-6, 154, 148, 132, 178, 154, 148. The two in the middle are kind of strange, could that be a bad head gasket? Would that cause the engine to shut down? Any other ideas? Could the coil, distribtor or ignitor work for a couple of seconds then die?
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