[Shotimes] '90 SHO produces no torque.

[Matthew Haggard]

Hey, 

I'm having an interesting problem, interesting being defined as anything upleasant, once it's over.  I have a 90 SHO,well technically 2, but the physically ugly one runs perfectly.  The "pretty" one's check engine light comes on.  Code reader says that it's the EGR partly open.  I've replaced the valve, no good.  I'm about to take off the manifold and clean it out, but problem seems to be more extreme than egr problems could acount for.  In a nutshell, no power.  Nada, zilch, zip.  It idles ok, but snapping the throttle results in it slowly revving up, followed by nearly dying as it dips to a couple hundred rpm, then recovering.  It doesn't make enough power to make it up my driveway.  Maybe a 4% slope.  It doesn't have any trouble starting really, except that it doesn't rev up like the other one when it's cold, but I've seen tricycles with more torque and I'm talking the kid powered kind.  I've replaced the O2 sensors, justifying it as routine maintenance to myself.  I've checked the act sensor and swapped MAF with the other sho, clearing the Keep Alive Memory each time.  In each drivability test, usually a :30 minute loop, it runs ok on level ground albeit gutless, but I have to get the truck to tow it up the hill to my house.  Aftermarket engine parts are a SHO Shoppe Y-pipe and cat-back system and a K&N Air filter.  If anyone has any ideas at all where to go from here, I'll be eternally grateful and all the hair I've pulled out in frustration might actually grow back.  


Matthew Haggard
mthaggard@earthlink.net
There is a certain satisfaction in feeling that you are bearing, with heroic
resignation, the irritating folly of others. 
-Jerome K. Jerome
"Passing of the Third Floor Back"