[Shotimes] My sick SHO again

Tue, 20 Apr 2004 14:53:53 -0400

>Just want to make sure, CPS and CID, crank and cam sensor?

Aye.

>What year, what tranny?

'92 MTX, 150k

>Usually low mileage is either bad O2 sensors (normally throws a code) or the
>engine isn't warming up. Three are at lest 3 coolant temperature sensors.
>The 2 wire one feeds the idiot gauge on the dash, the three wire one in the
>same area feeds the PCM, the CELO sensor in the heater core supply pipe
>keeps the interior fan off until the engine is hot.

The one I replaced was a single-wire sensor that threads into the thermostat housing.

>If you haven't replaced the thermostat, I would look into that. Make sure
>you get one with a jiggle valve on it.

I replaced it with a Stant 13979, seen here:

http://www.partsamerica.com/SelectParts.asp?SourceArea=SHOP&PartType=135&PTSet=A&Description=Cooling+%26+Heating&SourcePage=PartTypes&SearchFor=Thermostat+%2D+192%2F195+Degree

The old one I took out looked exactly the same.

>As for your tach not working, the only other thing you haven't replaced is
>the DIS.

I did replace the DIS module.  The plastic thing on the pass. side of the intake with 2 electrical connectors.  (Yes, I cleaned the surfaces and applied fresh heatsink compound.)

>Since you didn't include the IAB in your list, the low RPM stumble could be
>it. Try cleaning it.

I did clean it a little.  I guess I should re-clean it thoroughly since it still had a lot of carbon.  I also applied 12v to the connector and verified visually that it is opening and closing.

>You can clean the MAF with some contact cleaner available at Radio Shack.
>
>Do you throw any codes? Run a KOER and KOEO test and post the results.
>
>My ATX got 20-21 MPG consistently in mixed driving and 25 or so on the
>highway.
>
>
>Paul L Fisher
>
>1999 Ford Taurus SHO TR 64K - Stock. Kirk'ed.
>
>Visit my website: http://www.paul-fisher.com
>SHOClub Member: http://www.shoclub.com
>Amsoil dealer: http://www.paul-fisher.com/oil
>
>
>-----Original Message-----
>From: shotimes-admin@autox.team.net [mailto:shotimes-admin@autox.team.net]
>On Behalf Of Jonas Diener
>Sent: Tuesday, April 20, 2004 1:12 PM
>To: shotimes@autox.team.net
>Subject: [Shotimes] My sick SHO again
>
>Thanks for all your suggestions regarding my last long post.
>
>Unfortunately I still haven't got it all worked out.
>
>The main problem is a stumble at low RPMs, especially when the engine is
>still cool.  It also is hard to start sometimes, and feels somewhat weak at
>higher RPMs -- Feels as if the spark timing is retarded.
>
>I don't get very good fuel mileage either.  My last tank of 93 octane got me
>about 14MPG.
>
>So far I have replaced (in the order listed) the inline fuel filter, CID
>sensor, CPS, plugs & wires (sealing the plug wells at the same time), and
>the DIS module.
>
>The plugs & wires made a big difference.  It no longer misses or burns fuel
>in the cats.  The other things didn't seem to make any difference.
>
>I also checked the fuel pressure at idle and under load.  It looked good.
>
>It seems as if the air/fuel mixture is screwed up.  When it's cold, if I
>snap the throttle wide open at idle, it will chug and hiccup for a second or
>two before it revs up, sometimes even stalling.  It's not as bad when it
>warms up, but it's not right either.
>
>The guy I bought it from seemed to think the MAF sensor had a problem,
>although he didn't elaborate as to why he thought that.  Visually it looks
>OK and I've re-seated the connector a couple times.
>
>The tach on the dash has never worked since the day I bought it, which is
>what led me to suspect a DIS problem.
>
>Another weirdness is that the temp gauge always reads low.  It does move, so
>it's not totally broken, but it never makes it above the bottom white line
>on the "normal" range.
>
>I replaced both the thermostat and the sender unit to no effect.
>
>I also dropped the Y-pipe to check for the nasty sand stuff.  While the pipe
>is shaped in such a way that I can't see into the cats, I shook and knocked
>it around a bit and no sand or other debris fell out.
>
>Anyway, the possibilities for what's causing my stumbling problem are being
>narrowed down.  Right now I think it could be any of the following:
>
>* A vacuum leak.  I've have ordered a new upper intake gasket thinking it
>may be leaking there.
>
>* The butterflies for the secondary intake runners are stuck open.  I plan
>to clean the intake good the next time I have it off and check the butterfly
>operation with a vacuum pump.
>
>* The MAF sensor is indeed screwed up.  (or the BAP sensor.)
>
>I'm half tempted to buy an LPM as a remedy.
>
>The computer doesn't report any meaningful codes.  Sometimes KOEO finds an
>IAB problem and sometimes it doesn't.  The stored codes have told me the
>HEGO sensors read too rich, as well as too lean.   I have yet to have it
>complete a KOER test without stalling (tried many times on different days at
>different engine temps).
>
>I'm open to ideas...again.
>--
>
>the truth may be out there
>but lies are in your head
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-- 

the truth may be out there
but lies are in your head