88_Blue_Brick
New member
- Joined
- Sep 10, 2015
- Location
- Pennsylvania
So my 1988 244 DL has been running pretty rich. It misfires at idle, and you can see a bit of black smoke. I checked the 02 sensor with a multimeter and it was steady at 0.860v at idle. I raised the RPM until it ran smooth (no longer misfiring) and the reading stayed steady around 0.840v-0.860v. I then snapped the throttle and let the engine settle back down to idle. As the RPMs were coming back down, the sensor voltage dropped to lean, around 0.024v, before the engine settled back to idle. The voltage then climbed right up to 0.940v steady. I haven't had much time to look into anything in depth, but I don't think the car as any vacuum leaks, 19inHg at idle, the needle flutters but I believe this is due to it misfiring. If I bring the car off idle, it stops misfiring and the needle goes up to 21inHg and stops fluttering. The fuel pressure regulator is not leaking, and I replaced the engine coolant temperature sensor (not the one for the gauge) since it was cheap. I also checked the accordion tube and found no holes. What I want to do is check all the sensor voltage/resistance values at the computer connector to rule out wiring before I start throwing parts at it. Would a Haynes manual be of any use? I could pick one up today from the local Pep Boys. I've seen a lot of people mention Bentley manuals, but I'd have to order one and they cost way more than the Haynes manual. I've also skimmed through the Green Books, but didn't find the info I was looking for (I like numbers and parameters). Do I need to look more thoroughly? I also read that there is no real way to "test" the AMM outside of an electronics lab. Anyone else know otherwise? I don't really have the budget to buy a re manufactured Bosch AMM, and I don't know if I'd trust another brand.
Any help would be greatly appreciated. I normally deal with OBDII cars at work, so I'm used to seeing PIDs and having access to specs and parameters. This is my first foray into the pre-self-diagnostics, and it's proving to be an interesting adventure so far lol.
Any help would be greatly appreciated. I normally deal with OBDII cars at work, so I'm used to seeing PIDs and having access to specs and parameters. This is my first foray into the pre-self-diagnostics, and it's proving to be an interesting adventure so far lol.