end of my rope

Wed Apr 7 03:52:36 EDT 2004

Swap the fuel pump relay in from the '86.  I have an old fuel pump relay 
that makes my car run like yours.  Beats me how, but it does. 

I assume you swapped in the known good ignition wires and plugs?  What 
about the coil?

Also, have you checked the ECU codes after a run with the miss?

Try, if you have not, disconnecting the cold start injector wires.  Just 
to make sure no extra gas is coming in from the cold start injector.

Consistent rich is still an indication of an air leak between the 
metering box and the cylinders.  You are sure the intercooler is not 
leaking?  All of the air hoses are really ok?

Best,

Bernard Littau
Woodinville, WA

Livolsi, Stephane wrote:

>This is more a lament than anything.  Just throwing all the info out
>there, hoping something will stick.
>Tell you what, if someone comes up with something I haven't tried yet
>and it solves the problem, there'll be a few bucks in it for them.
> 
>Patient is an 88 5ktqa - beautiful tornado red, cosmetically very nice
>and has been running well since I bought it in Aug 2003.
> 
>A couple weeks ago I started having a 'missing' problem.  Idle was a bit
>rough, but the miss was most pronounced under heavy load - for example,
>2nd gear, 2500 rpm and accelerating hard.  Also, boost and power are way
>down.  When accelerating, the car would accelerate but not as rapidly as
>it should, and would periodically surge ahead, then cut back.  The
>surging ahead seemed more frequent as I let up on the throttle.  To
>rephrase, the car would run better as I reduced throttle.
>The car was definitely running rich. spark plugs, exhaust, o2 sensor all
>black.  This rich running seems to be fixed, but still have this missing
>and cutting out under power.
> 
>I have an 86 5ktq sedan which is not so nice cosmetically, but ran
>really, really well.  I've had it for about 6 years and stayed on top of
>maintenance and repairs.  The car ran flawlessly.  It has served as a
>donor over the weekend.
> 
>Here's what we did:
> 
>Swapped over all coolant sensors and the idle/wot switch and isv.
>Swapped the o2 sensor.
>Swapped over the spark plugs, coil, distributor, plug wires.
>swapped over any suspect vac lines - checked all, and I mean ALL
>connections and lines.
>Swapped over the fuel distributor, lines, injectors, including the warm
>up regulator.
>Put in a new fuel filter and air filter.
>Checked the fuel delivery and it DELIVERS...  1/2 liter in about 10
>seconds.
>used the DMM and checked air temp sensor, continuity of the temp sensor
>to ecu, coil specs, grounds.....all check out ok.
>The cat is not plugged - trust me, it is NOT plugged.
>Swapped the ECU from the donor into the good car, then went back to the
>original ecu because it didn't make any difference.
>(86 donor car has a mac 10, the 88 car has a mac 11c)
> 
>Swapped over the radiator but that was because we broke the neck on the
>old rad.
> 
>I wrote the above on Sunday night.  Monday morning taking the kids to
>school I get a few hundred meters from the house and Knock, Knock,
>Knock.  Oh Oh!  This is bad.  Serious knocking in the engine, changes
>directly with rpms.  Rod? Bearing?  Regardless of what it is, it's time
>for a transplant.  Fortunately I have a very nice MC engine sitting in
>the 86 5ktq.
> 
>Monday I do the transplant, get the donor engine in and took the
>opportunity to install the new engine mounts and valve cover gasket that
>have been sitting in my basement for a while.  Tuesday, hook everything
>up, check, double check, triple check connections.
>Fire it up and at first it ran quite poorly with a steady miss.  This
>really annoyed me.  Everything in that engine bay came out of the 86
>parts car which ran like a top!
>We managed to get a good idle after swapping the under dash Idle Volume
>Control.  Thanks to SJM's site where he has part numbers for different
>cars, we found the one in the car was incorrect, but the donor car had
>the right one.  
> 
>Also, we found that there is a silver metal box in the driver's dash
>(screwed to the inside of the lower dash) that has a blue and white wire
>cut.  It almost looks like someone did it on purpose, but they sure left
>the wires frayed.  putting the 2 ends of the wire together doesn't seem
>to improve anything.  Anyone know what this box is and could it be
>related to the hesitation under acceleration I am experiencing?
> 
>So now we have a nice smooth idle, occassional burbling, no black
>exhaust.
>The problem is still the acceleration and boost.  When I accelerate it
>sounds like an air cooled VW, and has the power of one too.  I just
>don't get it.  What have we missed?  What was left in the car that could
>affect acceleration? 
> 
>Ecu wiring?
>Wastegate frequency valve (this is on the firewall by the coil, right?)?
>Oh, I also noticed a purple wire running under the passenger side
>carpeting going towards the rear of the car.  The other end is
>unattached in the area of the ecu.  Can't see where it would connect to
>though.  It definitely does not look like it was factory installed so I
>don't think it is a likely suspect.
> 
>Like I said before, cash for innovative ideas that can cure this.  You
>won't retire on it, but I'll make it worth your while.
> 
>Stephane
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