I have a 97 LX. It got to running real crappy so I installed new plugs and wires, a new PCV
valve, replaced the U shaped rubber hose from the PVC to bottom of the intake and the two rubber parts in the line from the air intake tube to the front valve cover. Also cleaned the throttle body (back side of it was dirrrrty), lower intake and secondary valves as good as possible and flushed the upper intake with solvent. The IAC
passage was just about totally blocked, now it's not.
The plugs didn't look all that bad, I suspect it was the almost blocked IAC
passage was causing the bad idle, just took getting on the gas a little to make it run mostly better.
Problem is now most of the time it wants to idle over 1,000 RPM
. City gas mileage is not very good now. Acceleration from stop to 55 is very nice, an I wasn't pushing the pedal close to the floor.
No check engine light, no codes. I had the battery disconnected while doing the work.
I suspect it's an ex-rental fleet car due to it having a 7,000 RPM
tach when an LX with DOHC
V6 was supposed to have an 8,000 RPM
tach. Does have the 120 MPH speedometer. Another "thing that makes me go hmmm" is the PCV
tube and hose from the intake duct to the front valve cover is not at all like the photo of the Dorman (or other brands) replacement for that part for a 97. It has a 90 degree rubber elbow at the valve cover and the "why is this here?" 90 degree connection at the intake tube that requires the special shaped hose - when a perpendicular connection and straight hose would have been the logical choice. Dorman's replacement has what looks to be a less than 90 degree valve cover elbow and incldes a plastic tube that's not the same shape, assuming they have the right photo. Why would I want to replace the hard tube when there's nothing wrong with it, and it doesn't include the rubber hose to the intake duct. I've owned and/or worked on a lot of fleet vehicles and most of them have had "This doesn't exist." or "We never made that." combinations of parts which make them difficult to find the correct parts for repairs. (Ask me about a 2004 Dakota with a V8 made *mostly* of early 2003 parts that shouldn't have been in that truck.)
BTW, every time I work on newer cars I wanna swat whomever designs them with the PCV
connected to a dry part of the intake. All that does is cause crud buildup. If it was routed to a wet part of the intake, there would be no buildup problems. Even a GOOD vapor/oil separator would help. I've seen ONE car with a factory PCV
oil separator, a 1994 Oldsmobile Achieva, but it was a *bad* separator that hardly did anything. It had some filter in it like a chunk of a washable furnace filter. It would get coated with oil then it would go through and grunge up the inside of the intake.