SHO won't do codes

[BeatDaSHO]

well my brother and I picked up a SHO today that was for sale. This makes it our 4th SHO. It is in immaculate shape. Anyway, it won't run right. You can start it and it will spit and sputter and sometimes die but if u give it gas it will stay alive but still spit and sputter. Our first thoughts were the timing belt was off. We took off the timing cover and checked the timing and that is set correctly. The owner was a SHO enthusiast and did all of the maintence himself. He replaced the DIS, CPS, and CID and couldn't find the problem. He has been working on it since april and couldn't find what was wrong with it so he gave up. Now, my brother and i decided we would scan the codes. We inserted the paper clip and turned the ignition on. The check engine light just stays on and there are no sensors or anything clicking. (don't worry, we KNOW how to check the codes). Does this seem like a computer problem?? We switched out the IRCM above the radiator but that didn't change anything. Computer possibly? anyone else have these symptoms?

Greg

 

[Mr Anonymous]

Hmmmm.... I wonder if you might have a short in the engine harness somewhere. Try the old wiggle test and see if anything changes. You might also want to pull the harness from the EEC and check to make sure there's no corrsosion on the contacts.

This may seem rudimentary, but did you verify the plug wires were installed correctly? If he used a chilton's manual there's a good chance they are in the wrong order which might explain the sputtering.

 

[93MTXSHO]

Mine had similar symptoms. It would only idle at about 2700RPMs and wouldn't turn the cooling fan on. If it idled down to where it should have been, it wouldn't take any gas. It just ran like crap. I took it to the shop because I had no idea what the heck was wrong. I couldn't get any codes, even with a code scanner. The light just stayed on. They hooked up some kind of monitor and everything was haywire. It was telling them that just about every sensor in the car was no good. After 5 days, they finally narrowed it down to computer failure. Replaced it, and I haven't had any problems since.

 

[Slo-Sho]

If it's the same EEC, did you try swapping them? It only takes a few minutes.

 

[BeatDaSHO]

Ok this is going to sound bizzare. One error we did to start off the day was we forgot to disconnect the battery ground. We then disconnected the computer and put in the other one. We immediately try to scan for codes, and this time it did go into the self diagnosis mode. Sweet we thought, slapped back the timing cover, etc. Now the computer was in the engine compartment and not under the dash for testing purposes. Went to start it now, and it just keeps cranking. Hmmm now what? So we tried another IRCM, cam sensor, and DIS module. All were parts he had left over that were supposedly working when he swapped them out thinking those pieces could be the problem. We tried again, still the same thing, with the occasional sputter. I am completely lost. I even tried another working DIS and another computer. Still nothing, but the car would go into the self diagnosis mode when scanning for codes. I tried putting the car back to the way when I bought it, and it still does the same thing. It won't even run now, and it did before. I doubled checked the ground strap, and even made another one from the crossover tube bolt to the battery terminal. Still nothing. The car does have spark though. I even sprayed carb cleaner in the throttle body, and it still won't fire. I didn't have my fuel pressure gauage on me, but the fuel pump does cycle. Could some sensor have shorted when I forgot to disconnect the battery? Even though it has spark, maybe the CPS is bad? I tried scanning the car for codes with the other computers, and I got code 11's every time. (prob because the car wouldn't run to even pick up a code though) What now? We are clueles??

Doug And Greg... AKA SHO Bro's

 

[projectSHO89]

pull the SPOUT connector and check timing.

If you have a timing light, hook it to either the #1 or #5 cylinders (they fire at the same time and # 5 is a LOT easier to reach) and see if it's on time. It should fire at 10 degrees BTDC.

While you're at it, check to make sure the plug wires are installed correctly. As a matter of fact, check that first.

Steve

 

[BeatDaSHO]

The car did run before I did anything. It just didn't run right. Sputtered etc. I didn't touch any of the plugs or wires. Still clueless...

 

[projectSHO89]

Go check the plug wires and the timing.

At least that will give you a break from pounding your head into the wall.

Steve

 

[BeatDaSHO]

So I go back to the beast again tonight where I have it stored. (I couldn't stop thinking about what could cause the problems) Anyway... I checked the spark plugs wires, and they are correct. I don't have a timing light, so I couldn't check the timing that way. Nevertheless, I took out the original computer and went home. I put the original into one of my other SHO's. Would you believe the car ran fine! I couldn't believe it. But this is the same computer that wouldn't let the car go into the Koeo test. I even tried the Koeo test on the car, and it worked. It doesn't make any sense. Now I am really stumped. So recap... Car ran and sputtered but wanted to shut off. Tried to pull the codes, and it wouldn't go into the Koeo test. I checked the timing belt and the marks were all on par. I then slapped it back together and tried a different computer. It would go into the Koeo test, but wouldn't start now. I tried different computers, different cam sensors, DIS's, checked the ground strap and it still won't start. I also checked the plug wires and all look OK. Now I have no clue what to do. Any suggestions?

 

[Ian]

I don't know but , have you checked really simple things first? I'm a milwright and people usually think when things don't work, it's usually complicated, but I find 95% of the time it's usually simple like a fuse or a fuseable link. Have you checked to see if you have B+ at all the points you are supposed to at the ecm?

 

[Bluto]

I have the same no code problem.
My car runs fine now, but before when it was running bad I tried the KOEO test and the CE light stayed on.

The elecrtic fan comes on during this test, but otherwise nothing. I even tried my bro in laws mac scanner. It said no codes in library.

It does start the self diagnose test in the KOER test.

Again the car runs fine, but no codes. I posted a few weeks ago on this and a few guys much smarter than I gave me some things to check. I have not done them yet.

 

[RI-SHO]

This is kind of crazy, its like SHO curse 2002.

Would you Greg and your brother mind buying a modded 1993 black SHO with 118,000miles? Well maybe not so fast but I probaly will once I try one time by myself to figure out whats wrong with SHOForum's help.

Everything you changed above has been changed with my SHO includig EEC, are the spout connecters something you can replace/buy? I have even changed plugs and tried wires from a working SHO, what will the IRCM do if it not working?

And does that SHO crank and crank with a popping bogging sound?