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2-4kq's stumbling when cold
BOth my 85' an SO's 87' are stumbling when cold. Actually on my
85' it is intermittent like it is trying to get power but ends up bogged
when you floor it. At partial throttle it runs OK though. Just bogs when
you floor it. On the 87' it is All or Nothing. No power but then
sometimes it will kick in and run fine at HIGH RPM's like above 4k but I
dont like to rev it high when its cold. Anyhow, I suspect both have a
related or similar problem.
I have checked the temp sensor under the coolant hose going into
block and even replaced it on the 85' but it didn't change a thing. (put
in a known good used one that is 6months old from my 84' 4kq turbo project
car). Anyhow, its really annoying. Any ideas? When cars warm up a
little (read, when temp actually gets into the Normal Op range at the
first bar) then they seem to run Ok. Its just when they are really cold
that they do this. BOth cars seem to Idle fine. (wellk, the 87' Idles
fine) and they both start right up with just a crank of the key even in
ALSO: On the 85' (Different Problem I think), It idles low when
cold (500-600 RPM) and then high once warm (1,000-1,200 RPM) What gives
with this. Did someone put in the Idle COmputer Backwards. :-)
I have no clue what the Warm Up Reg do or what the Cold Start
Injector does but assume the Injector works or they wouldn'd start right.
And they Idle OK (Smooth at least) so ISV is probably fine?
Thanks in advance. It's getting annoying and since I have an
extra CIS system to pull from I want to try to fix it.
Oh, that extra CIS system. Runs great all the time but Starts
hard. This is the 84' 4kq. Could this be Cold Start Injector? Does
injector usually fail or the signal sender that tells it to fire?
Uhh, also, how does Cold Start Injector work. Does it just pulse
for a second on startup or does it always run untill motor is warmed up.
Ok, I'll stop asking questions. Thanks
1984 4000s quattro / modified/ awaiting Turbo Transplant.
1985 4000 quattro / Silver / Fixing it Up.
1987 4000cs quattro / Saphire Metallic Blue/ Girlfriend's
1996 A6q / Volcano / Dads Car
*****1985 5kt / PARTING OUT!