[AT] Isuzu smoke problems

Phil Auten pga2 at hot1.net
Sun Nov 6 13:31:43 PST 2005


Possibly a seal between the two halves of the turbo, allowing fuel to leak
into the exhaust side?

Phil

At 06:45 PM 11/5/05, you wrote:
>I bought a 1986 Isuzu cab forward truck with a 14 flatbed dump ( to haul
>tractors ). This is a 3.9L 4 cyl Turbo Diesel 5 speed manual. The PO had
>replaced the turbo with a later unit which is water cooled the original did
>not have water cooling. From what I understand it was a fairly common
>upgrade. The problem I have is smoke light blue to white on startup really
>bad, after warm-up the following conditions under load smoke is not a
>problem under coasting with no load just using the throttle to maintain
>speed I am blowing light blue smoke.  If I am completely off the throttle no
>smoke, as I transition back to power short cloud of light blue then clean.
>I just had the injectors rebuilt the injectors pressure was low and the
>spray patters were bad to poor.   I changed the oil and filters.
>I have not had it very long but I did not notice any drop in the oil level.
>It smells like diesel not engine oil burning. I believe this has 162K miles
>and it is probably a California vehicle with the timing set 6 degrees BTDC.
>According to the book Federal timing is 14 degrees BTDC.
>I am surprised at not being able to find very much information on this
>engine on the Net.
>One thing I am wondering about is the original turbo had a wastegate on the
>turbo unit to dump excess pressure into the exhaust.  There is no wastegate
>in this system now. I do not know how much boost it is running. In looking
>at pictures of other later engines  they look the same as mine plumbing wise
>with no visible wastegate.
>
>Anyone experience this before or know about these engines.
>
>Bruce Fallon





More information about the AT mailing list