VWDiesel.net The IDI, TDI, and mTDI source.
Engine Specific Info and Questions => IDI Engine => Topic started by: ryanp on March 14, 2010, 03:12:02 pm
-
My dad's newly installed engine needs the cold start lever for a nice start up when cold (well above 0degrees, so not freezing!) it runs rough and also smokes quite a bit for a minute or two, am i right in thinking this points to needing a little extra advance? I have it set to .95mm.
Also, it takes quite a bit of cranking when warm and the glow plug light does not illuminate (it does when cold) is this the coolant temp sensor? i disconnected it and it made it worse?
Cheers
Ryan
-
Let me know what you do to fix this...
I had a LOT of advance. I needed the cold start lever. A board member and I set it back to 1.0mm and I still need the cold start lever (he did too)
I'm starting to think it's normal...
As far as the starting when hot.
I crank the engine (little more than a bump on the starter) if it doesn't catch right away I stop cranking. Turn the key off and bump the starter again. It usually catches immediatly then. where if I kept cranking it wouldn't catch so fast.
-
Sounds very similar, anyone have any ideas?
Ry
-
Does it run rough and smoke WITH the cold start out? I don't see anything wrong with using the cold start to smoothen things out (that's what it's for) but it should start AND run good with it out.
If I start mine at 0F without plugging in it starts kinda slow and after it starts running I have to pull the cold start to get a halfway smooth idle. It cranks slower with the cold start out so I don't oull it 'til it's running.
-
yeah with the lever out it's a little smokey but nothing major and much smoother, my main worry is the fact that it's only mild and it needs it, when it's down to -10 i dont want to get the spanners out!
-
what miles are on it , injector nozzles could be a bit worn, good CR in the engine on all 4
-
it's done about 105k, was a good runner till i td'd it, lol.
I had a feeling about the injectors, i'm gonna run some Forte through it i think see if that makes it a little better.
-
complete newb question: how does the cold start handle affect the injectors?
-
complete newb question: how does the cold start handle affect the injectors?
It just advances the injection timing a little bit.
-
in what way? when I bought this car I found out I had to use the cold start handle in pretty much every cold start (15c and lower). which I thought was sketchy, but I had other things to worry about at the time.
now I'm trying to diagnose a floating idle issue (1000-1100 idle when cold, 950 when warm) and I suspect these may be related.
-
hot start problems i found were due to a serious lack of compression.
-
hot start problems i found were due to a serious lack of compression.
That is true, I've discovered that retarded timing can also make it crank a bit longer before starting, couple that with lowish compression and you got a problem. A cold engine is pickier, so it might start hard but run good/ok once it's up to temp.
-
My favorite hot/cold start problem was a leaky fuel system. Not bad enough to show, but bad enough for it to loose prime. Add a weaker compression engine that was otherwise good to start and I had some long cranking before starts.
-
for the longest time before i had my 1.9 head - my car would roll start instantly but never start with the starter when it was hot. the compression was just non-existant.
when it was cold however it would actually start a little easier. i dont know how that works. colder air more compression? hardly makes sense.
-
Still having this issue, fires on the button when cold but takes a good few turns when warm (E.g. left for 30+mins) but will fire straight up if its only been left for a couple of minutes!
Any one have any thoughts before i try to make an adapter for the compression tester? the engine was stood for a while prior to the conversion, could it be stuck rings?
Quite a bit of ££ has been put into stuff like belts, seals pump build ect so i'd like to keep this of possible!
Cheers!
Ry
-
was the piston height measured during the rebuild. was a three notcher head gasket thrown on there?
-
the head was never split apart from the block, The engine ran fine in the donor car a few months before!
Very strange!
-
Does it sound like the engine needs replacing with a better unit? i've got to tear the gearbox off again to do the rear main seal so it's not much more work really!
Thanks!
-
anyone? dont want to put any more time or money into this if i might aswel swap it out!!
-
??
-
Ryan, what you need first are compression test results from a 500 psi+ guage. Still want to know what you`ve done to that Z.