I have a 1989 E350 7.3L Diesel and i seem to have some glow plug trouble. i have searched posts for glow plug problems but, while ive found plenty of posts, havent had any luck on my prob. anyway here's the problem:
---what happens for two weeks now in 75 degree weather:---
turn key to glow plug position,
hear a click,
WAIT TO START light comes on,
few seconds later (usually between 8 -10, depending on ambient temp.) WAIT TO START light goes off
hear several intermittant clicks,
crank and start engine JUST FINE BUT ONLY FOR 4-5 SECONDS!
---what happens now:---
turn key to glow plug position,
WAIT TO START light comes on and stays on for 5 seconds then goes off
try to start, engine cranks but doesnt start for 30-40 seconds- if at all. I've tried waiting, heating the glow plugs several times before starting, etc. Every time the engine starts fine the first try, then always fails every time for the thirty seconds of cranking.
any help would be appreciated... the shop manual does not cover the diesel models very well, espeacially GLOW PLUGS.