sorry, pulled neg battery connection. Other than radio..what other memories might I lose? No gps..etc..
Anyway after pulling battery....left jumper in....code 12 flashed till I disconnected jumper. Now do glowing CEL..However, I am wondering if this might be the time to do such fixes as fix suggests. Funny EGR reminder 50k intervals. I am over due wouldnt you think for this as well as o2 thing. 3X says its a pain in the a to clean the EGR valve...probably a bad location..I havent looked at a labeled pic of the engine bay yet. Anyway...truck seems to be back where she was last week...but we will see. l Idles fast at start up for about 5 min or so..then at stop rpms drop to 1000. Not spec as far as I know..I take a drive this weekend to test mpg...thanks for all your help.
1995 Sidekick 16v. You should put your specs (plus tranny, etc.) into your signature so that everyone knows what you are driving without looking for it. Anyway, not quite sure I understand. You reset the ECU by pulling the neg battery cable (which is ok, only loses things like preset radio stations, etc. Pulling the dome light fuse, however, is way easier). But you left the jumper in while resetting and now the light is on full time? Is this what you are saying? Maybe start again. Pull your dome light fuse to reset without the jumper already connected. Put the fuse back in, now key on, is the CEL on. Now start the car. Is the CEL off? If not, try and pull codes and see if you get anything. If the CEL is off, drive for a day and see if the CEL comes back on. o2 codes are fairly rare, as it appears that the o2 won't throw a code unless it is practically dead. However, these should be replaced at about 100,000 miles. The EGR valve itself is not difficult to clean - just take it off the car and clean the valve with carb cleaner, so that all orifices on it are clear, and the diaphragm snaps back STRONGLY on its spindle. While the valve is off the car, clean the exhaust and intake ports that are visible with the valve off, reaming them out as best you can. Before you put the EGR back on the car, start the car up for about 2 seconds - the car will rev very high, but will also blow out additional, loosened carbon from those ports. Make sure that the EGR valve gasket is in good condition.
Your car should start up and rev to about 1500-2000 rpm cold start, then slowly drop to 800 rpm warm idle. Is your car warming up properly (do you have great heat in the cab?) Have you checked for vacuum leaks (pinching vacuum hoses, and noticing no difference in idle, other than on the hose from the air filter pipe to the ISC?). Didn't read the rest of this post again, so not sure whether you have confirmed that the car is timed and tuned properly. In any event, advise if you now have any codes after you have reset the CEL.
the EGR does these things.
1: if sticks open , idle goes too low and stalls.(or close to stall) 500rpm, etc...
2: if it wont open on demand, head valves run hotter,(shorter life) and dirty exhaust (smog (NOX) and fail smog test. + 1/2mpg MPG loss?
if 51 returns, it just means, #2 above. (after dome pull reset) ( takes driving)
The EGR can be a 1hr job or all day( both manifolds off, (total impacted,full of carbon)
my slide shows show the worst case, so you can plan. Fate does rule.
1. flipped ses
2. jumped test connection
3. code 51 displayed.
4. disconnected neg battery to clear code 51
5. jumper is still connected
6. code 12 flashing
7. removed jumper
8. CEL does not glow, I am assuming back to "normal"
9. Drove to work 5 miles, no performance issues per se
10. Plan to drive trip on weekend to further test performance and mpg.
1 hr or less to clean magic hole 1, i can do it in 30m (pull top main pipe clean 1 hole put back)
or all day.
here is ALL DAY. (experience)
all paths blocked 100% is very common (PO from H3LL ran car in limphome for over a year, inane )
if a quad EGR, add 1/2 day more... EGR can be a total Beach.
Presumably 'CEL does not glow' means that the CEL does glow with key on, and then is off when running. It often takes a while for the ECU to pick up new faults, after it has been reset. Fingers crossed that it doesn't come back.
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