Misfire and HOT ruuners....

[SHO U UP]

Hey everyone,
Gotta issue with the new '96 SHO. I'll make it simple and quick, hopefully. Got it with bad fuel pump and tranny. Replaced those items, new plugs, cam weld, injectors cleaned, JET chip, Magnaflow mufflers, coils switched F to B, the norm. Now, car ran fine after that was done and the next day. But, third day was bad misfire. Replaced plugs again, as some were nasty and black. When I unplug coil #s 5 and 6 nothing changes, as does when I pull the # 1 injector harness (easiest one to reach of course). I figured old, stale gas, but have dumped in Lucas treatment and now 93 octane. And the runners for the 5 and 6 cylinder are HOT to the touch, while the others are still touchable. But the plugs look somewhat normal while there is no excess deposits like before. Any advice will be appreciated gang. Thanks, ****.......

 

[Mr Anonymous]

Step 1: Remove Jet chip.

Step 2: Place on firm surface.

Step 3. Smash repeatedly with hammer.

Jet chips are garbage. I could make a better chip out of duct tape and breakfast cereal. Once you get that piece of crap out of your car you'll have a lot easier time figuring out what if anything is wrong.

 

[SHO U UP]

Hey Chris,
Thanks for the pointer, and perhaps I should have used a bigger hammer, because the problem is still there. I had a feeling the chip removal wasn't going to help, but it was worth a shot. I've experimented with alot of chips and I have good luck with all of them. But, it's out and it's off to the next step. You have a step 4 I should try? Like bang the car with the hammer? ****........

 

[gen3performance]

hey man i am currently having the same problem. i cant figure it out. i have also (today) changed my plugs, used a test light on the injectors, cleaned the maf and o2 in my cai ,ran throttle body cleaner through my intake (will running ),checked all vacuum lines. cant check the back coils with a test light my plugs where also black with suet i resantly got a check engine #7 misfire and running lean i don't know if these cars have an ignition majuale (<<<<i know i spelled it wrong)

do you have your lower intake butterfly's removed? although i didnt have a problem right after i removed mine about a week or so after is when mine started
im thinking it could be o rings on my injectors or to much air maybe a bent valve sticking but i am just guessing ooo yeah i own 96 sho 3.4 v8

not to forget a cam sensor going bad but the car should be hard to start so i don't think that thats it but what the ****

 

[SHOZ123]

If you took the butterfly shafts out there are a couple small holes on the bottom that need plugged.

 

[gen3performance]

are you talking about the two small flat head screws and the ends butt like i had said it didnt immediately cause a problem it took about a week or so and i have all holes plugged

 

[SHO U UP]

Thanks guys for the responses. I didn't remove my butterflies at all. Just cleaned the lower intake because it was hard to move. Once back in, it was fine. But, the 5th cylinder when I removed the upper intake was wet, real wet at the gasket and the holes looked really cruddy. The car did throw a IMRC stuck open (bank 1) and another odd ball code I can't remember. At the beginning I had installed a catless Y-pipe, but took it off a day later due to the noise. Perhaps that could have screwed up an O2 sensor in the short amount of time running??? But no other codes are present.

 

[gen3performance]

hey do you still have that cat less y pipe if so where did you get it or could i buy yours lol


i am going to try to figure this shit out today and my runners where also wet im not to sure what it is but it is pi$$ing me off this is my only car and the flow masters dont sound good with a bad miss

 

[SHOZ123]

Yes where the two flat head screws are.

 

[SHO U UP]

My Y-pipe is already spoken for, and I got it from Ray @ Midnight Auto Parts. It is a great looking pipe, but too loud for my taste. My other '97 SHO has 3" from the cat back to Magnaflow mufflers, and it sounds just right. A mix between a Cobra and a Viper. Plain out awesome! Yeah, the ones now sound like crap with the miss. I'm going to tear it down today/tonight and reinspect everything. It is very aggravating, but I have four other vehicles, including two more SHOs, but this is now a priority because I miss the V-8 sound. Keep in touch on your status too. ****....

 

[gen3performance]

if you could give me a link or pm me a phone# for that y pipe i would be great full



if and when you find out what it is pls pm me and let me know what it is. i cant figure it out tried again to day with know luck and do you no what people are talking about coils a -b or some thing like that is there an aftermarket coils or better ones for our car ? i was going to go for all new coils. after that injectors after that all new gaskets from block up and pressure test the heads. basically rebuild the whole top end. when i can come up with the money

 

[SHO U UP]

I don't know of any aftermarket coils for the SHOs. I have a few spares here and I tried that too, especially in #5. Nothing changed. I just now wired the butterflies open as #5 and 6 weren't opening at all and #5 was all gunked up again. They were really hard to open by hand, and even though they are now wired wide open, it hasn't cured a thing. I'm back out to see if what's next, as I'm about ready to give it to a shop on Monday and say "FIX IT!" Later....

 

[gen3performance]

well thats cool there is a connecting clip for the rods the butterflys are on. it is 2 rods joined with a clip maybe the clip hass broke and only the first 2 butterflys are opening you have to take the lower intake off to get to it wireing them open will not work if the clip in the middle connecting the other 2 flaps is broken it sound like this is what it is save yourself that 75 dollors any hour charge and pull the intake manifold flip it over and take a look i will try to post a pic for you good luck

 

[gen3performance]

here is the clip i am talking about i just happen to still have it i keep everything normaly http://render1.snapfish.com/render2/is=Yup6aQQ%7C%3Dup6RKKt%3Axxr%3D0-qpDP-WtlfRt7Pf7mrPfrj7t%3DzrRfDUX%3AeQaQxg%3Dr%3F87KR6xqpxQQQaxoaPxoJnxv8uOc5xQQQJenGenloPJqpfVtB%3F*KUp7BHSHqqy7XH6gX0QQP0%7CRup6lQP%7C/of=50,589,443
http://render1.snapfish.com/render2/is=Yup6aQQ%7C%3Dup6RKKt%3Axxr%3D0-qpDP-Wt0fRt7Pf7mrPfrj7t%3DzrRfDUX%3AeQaQxg%3Dr%3F87KR6xqpxQQQaxoaPxoJnxv8uOc5xQQQJenGenGeJQqpfVtB%3F*KUp7BHSHqqy7XH6gX0QQPo%7CRup6lQP%7C/of=50,589,443
http://render1.snapfish.com/render2/is=Yup6aQQ%7C%3Dup6RKKt%3Axxr%3D0-qpDP-Wt0fRt7Pf7mrPfrj7t%3DzrRfDUX%3AeQaQxg%3Dr%3F87KR6xqpxQQQaxoaPxoJnxv8uOc5xQQQJenGenloPlqpfVtB%3F*KUp7BHSHqqy7XH6gX0QQPQ%7CRup6lQP%7C/of=50,589,443
http://render1.snapfish.com/render2/is=Yup6aQQ%7C%3Dup6RKKt%3Axxr%3D0-qpDP-WtofRt7Pf7mrPfrj7t%3DzrRfDUX%3AeQaQxg%3Dr%3F87KR6xqpxQQQaxoaPxoJnxv8uOc5xQQQJenGenGeJPqpfVtB%3F*KUp7BHSHqqy7XH6gX0QQQa%7CRup6lQP%7C/of=50,589,443
http://render1.snapfish.com/render2/is=Yup6aQQ%7C%3Dup6RKKt%3Axxr%3D0-qpDP-Wt0fRt7Pf7mrPfrj7t%3DzrRfDUX%3AeQaQxg%3Dr%3F87KR6xqpxQQQaxoaPxoJnxv8uOc5xQQQJenGenloPnqpfVtB%3F*KUp7BHSHqqy7XH6gX0QQPQ%7CRup6lQP%7C/of=50,589,443

 

[SHO U UP]

Hey,
Thanks for the info. They are very similar to the V-6 models. I have about six sets of those here I have modded and put back together. But, I believe those are the last thing on my mind. Number 5 cylinder went KA-BOOM! Kinda like Carter's did with the supercharged one. It's getting towed back home tonight/tomorrow for me to further inspect it. After it was cut on at the shop for diagnosis, a loud clunk was present, followed by sputtering, and a puff of smoke belched from the car and it died. Diagnosis quickly stopped, and now I will have a nice green lawn ornanment, with a brand new tranny and welded up cams. I'll get it apart this weekend, maybe, and decide to sell her as-is, or get a short block and drop that &%#$ motor and subframe again. I'll keep you guys posted. ****........

 

[SHOZ123]

Where did the broken parts of the clip go?

FWIW removing the shafts will take ~3 sq" of obstruction out of the intake track. But this is not what is obstructing each individual cylinder per intake stroke.

 

[gen3performance]

Hey man just wondering how it is going with your car. I am still have trouble with mine. Hope you are having better luck . Haven't had the money to get new coils yet . But I'm still working on it .

 

[SHO U UP]

Hey,
I've given up on that car. I got another one yesterday to replace it. I dumped way too much money in it, and it's a shame because it is in great shape. BI haven't narrowed it down, but when it sounds like pots and pans banging together in the motor, SEE YA! At least it wasn't a cam failure. Has anyone else ever had low end damage in an SHO before?? It's a new one on me. Good luck on yours. ****......

 

[gen3performance]

hey do you want to peace it out i think mines coils if so i will take what ever new parts like egr valve and what not off your hands to if you give me a good price where do you live pm me and tell me what you think

 

[NebraskaSHO]

Hey,
I've given up on that car. I got another one yesterday to replace it. I dumped way too much money in it, and it's a shame because it is in great shape. Better shape than the one I just got! I haven't narrowed it down, but when it sounds like pots and pans banging together in the motor, SEE YA! At least it wasn't a cam failure. Has anyone else ever had low end damage in an SHO before?? It's a new one on me. Good luck on yours. ****......

Bottom end damage can occur after a cam has let go and then heads have been fixed.