: > OK, here's the drill. Recurrent check engine lights for most of the : > past year. Lousy, loping cold idle; has had MAF replaced, new vacuum : > hose installed to the dash controls, IIRC a new O2 sensor, crank : > position sensor, new battery, probably some other things I have : > forgotten. I posted about the brake booster a while back as a possible : > source of the terrible idle, which passed all the tests I could find to : > try. The passenger side power windows work sporadically at best (and : > didn't before she bought it). : >
: > Checking the OBD to see why the check engine light is on, I get 1-1-1 on : > socket 2 and 1-4-4 and 1-4-3 on socket 6. Those check out as "missing : > load signal from LH control unit" and "knock sensor signal missing." I : > cleared the codes, we'll see how long they take to come back (and if any : > others appear). : >
: > Any suggestions on further user-performable diagnostics to figure out : > what's going on? : >
: > Thanks! : : : Usually problems like this can be attributed to dirty connections or bad : grounds. It would be worthwhile to clean the fuse panel contacts since : they are notorious for corroding in 240s, and there's a fuse holder : under the hood attached to the inner fender that can be problematic. The : sensors themselves rarely fail in my experience.
Hi Tim,
Further to the excellent advice from James (and I can vouch for the "notorious" bit......), remove the fuses from the fuse panel and clean the fuse panel brass contacts thoroughly by sanding or wire brushing until they are shiny, similarly with the contacts on the fuses themselves; then coat all contacts with dielectric grease before reinstalling the fuses.
Better still, throw out all the fuse panel fuses which have grey-coloured contacts and replace them with same amp-value ceramic fuses with BRASS contacts. This will eliminate the "galvanic action" which takes place between dissimilar metals and causes the loss of continuity.
My local Volvo dealership did not stock these recommended fuses but I found them in (sad to say....) an outfit catering to VW's!!
Good Luck. Andy I. ('58 445 "wagon"; '65 122S wagon; '67 121 2-dr direct import; '74 145 wagon; '74 142; '86 240 wagon; '93 240 "Classic"-model wagon; '97
850 AWD Turbo wagon.) All stick-shifts.