[s-cars] Occasional Smoking - continued

[Joshua Van Tol]

What are the units on the compression test numbers? If they're in bar then
those numbers would equate to ~140 psi, which sounds pretty okay. The
chugging, smoke, and fouled plugs sound like a mixture problem.

I'd look at the following items:

All wiring connections in the engine EFI harness, but especially the MAF
connection and the coolant temp connection. Disconnect and inspect closely
each one.
Engine harness grounds.
Fuel pressure regulator diaphragm - check for rupture.
Leaks in the intake system.
Bad MAF?
Bad fuel injectors?




On Thu, Nov 7, 2013 at 2:13 AM, Brian Pleet <subscriptions at strategico.ca>wrote:

> My 90 90Q seems to know it's approaching 250k km by acting her age.
>
> For a few weeks the idle went wild, she belched (white) smoke erratically,
> she'd threaten to stall (but never did) on deceleration.
>
> Having gained my full attention, I did a compression test, followed by a
> leak down test; Head was rebuilt @ 125k, lower block is all original. I
> have a rebuild able 3B avalable for building a sleeper car.
>
>          CYL   COM           WET    DRY    LOSS%
>
>    - #1       9.6,            10.0      6.5     0%
>    - #2      10.5            10.5      7.0     17%
>    - #3        9.7            10.5      7.0     5%
>    - #4        9.5            10.0      6.5     0%
>    - #5        9.7            10.5      7.00    0%
>
> Cleaned the ISV, replaced the O2 sensor, cleaned air filter, replaced the
> rotor and cap and put it all back together. For the past 3 days she's been
> purring...except
>
> The plugs are covered with a black dry soot and it smells of hydrocarbons.
> On occasion, if I watch in the mirror, I can cover the car behind in white
> smoke (like James Bond) If I measured mileage  it appears to be down. Oil
> consumption is a little elevated.
>
> She's giving me hints but I can't talk to her (blink test says she's fine).
>
>
> Suggestions?
>
>
> Brian
> 90 90Q
> 95,5 URS6
> 09 TT on the way
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