VicK wrote:
I too was puzzled by the short time the glow plug indicator was on. In the manual, I found the the time the glow plugs are ACTUALLY ON, as related to coolant temperature. This was shown below (more succinctly), but here it is again, directly from the manual for the CRD, page 8i-25:
(sorry for all the dots... this site doesn't recognize spaces so I had to fill them in with something).
engine coolant temp......wait-to-start lamp......Pre-heat cycle (time..........Post-heat cycle
.....with "Key on"...............time "ON"................plugs are on B4 start).....time on (after start)
...-30 C / -22 F.....................10 sec ......................35 sec ........................200 sec
...-10 C / 14 F......................10 sec ......................23 sec ........................180 sec
...+10 C / 50 F......................1 sec ......................21 sec ........................160 sec
...+30 C / 86 F......................1 sec ......................20 sec ........................130 sec
...+ 40 C / 104 F....................1 sec ......................19 sec ........................140 sec
...+ 70 C / 158 F....................1 sec ......................16 sec ........................ 20 sec
So big surprise to me... the glow plugs are ALWAYS operating for a while, just for a different length of time depending on coolant temp, even when the engine is warm. So when starting in the winter.... WAIT 22 seconds after seeing the indicator go out in 1 sec, or lasts even 10 sec if its below -10C/14F. THEN YOU HAVE ACTUALLY USED THEM PROPERLY.
DUH on Jeep.... like they couldn't leave the light on for the actual pre-heating time? Really?
Can anyone verify these on times? I thought the manual was wrong?