LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

97 lt1 missfire on #7 i need help!

Old 06-11-2018, 06:26 PM
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Re: 97 lt1 missfire on #7 i need help!

Originally Posted by Chimera96 View Post
wtf...car was under water including the pcm…

was the pcm4less tune done after the flood?

so the opti was completely submerged also??
Opti is brand new and no it wasn't on the car when it flooded. Pcm was though and it was tuned before the flood.

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Old 06-11-2018, 06:39 PM
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Re: 97 lt1 missfire on #7 i need help!

Originally Posted by shoebox View Post
Yeah wow, seems odd to mention this now. If the PCM was submerged, there isn't much of the car that wasn't (unless it was pointing severely nose down). Could even be dried silt inside the opti, disrupting the timing windows.
Pcm was on the car but not the opti when it flooded. Car ran ok when i got it running but like i told one guy one of the hoses on the water pump started leaking coolant and then the miss came up. So i checked it and #7 isnt firing.
Might be the ecm, might mot be since it ran fine before the hose leaked coolant.

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Old 06-11-2018, 08:54 PM
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Re: 97 lt1 missfire on #7 i need help!

Then it is back to checking the opti.
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Old 06-11-2018, 08:58 PM
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Re: 97 lt1 missfire on #7 i need help!

At any point have you put a scanner on the PCM, and pulled the misfire counts by individual cylinder? You might find there are other cylinders beside #7 misfiring, just not as frequently.
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Old 06-13-2018, 06:14 AM
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Thumbs down Re: 97 lt1 missfire on #7 i need help!

Rock auto has discontinued their phone service dept, internet service only.
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Old 06-16-2018, 08:05 AM
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Re: 97 lt1 missfire on #7 i need help!

If needed, I have a PCM from my 1997 WS6 I can sell to you for $190 shipped if you're interested. It was tuned by PCMforless. I no longer need it because I'm now running a TorqHead 24x system with a different motor setup. I don't know what's done to your car, but this PCM is tuned for the following:
Comp Cams 280XFI XTREME cam .230/.236.
AFR LT4 195 CNC Competition Ported Heads with 1.6 rockers.
Stock throttle body.
6spd manual and stock 3.42 gears.
Long-tubes with rear 02 sensors deleted.
All of the emissions crap deleted.
19 x 13 rear wheels / 345-30-19 tires.
39 lb SVO fuel injectors.

I had an LT4 knock sensor in it, but I pulled it out and sold it. Therefore you'd have to install your existing knock sensor.
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Old 06-16-2018, 12:04 PM
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Re: 97 lt1 missfire on #7 i need help!

Originally Posted by carlos64030 View Post
If needed, I have a PCM from my 1997 WS6 I can sell to you for $190 shipped if you're interested. It was tuned by PCMforless. I no longer need it because I'm now running a TorqHead 24x system with a different motor setup. I don't know what's done to your car, but this PCM is tuned for the following:
Comp Cams 280XFI XTREME cam .230/.236.
AFR LT4 195 CNC Competition Ported Heads with 1.6 rockers.
Stock throttle body.
6spd manual and stock 3.42 gears.
Long-tubes with rear 02 sensors deleted.
All of the emissions crap deleted.
19 x 13 rear wheels / 345-30-19 tires.
39 lb SVO fuel injectors.

I had an LT4 knock sensor in it, but I pulled it out and sold it. Therefore you'd have to install your existing knock sensor.
Your setup is pretty close but not identical to mine so i would need to send it off again and pay them full price for the tune.
I wish they'd(pcmforless) give me a harvey affected customer discount 🤨 since i didn't even get to use it much. Still not sure its the pcm. Takin off the optispark now.
Thanks though

97sswcubes

Last edited by 97sswcubes; 06-16-2018 at 02:12 PM.
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Old 06-16-2018, 12:07 PM
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Re: 97 lt1 missfire on #7 i need help!

Originally Posted by Injuneer View Post
You only have to remove the damper/pulley portion, the hub does not have to be removed. Typical problem is rust on the hub, sometimes requires a 3-jaw or a crow foot (96/97) to get the damper/pulley loose.

http://shbox.com/1/pull_pulley.jpg
Hey guy i thought you said i didn't have to remove the hub?
Im there now and the opti doesn't clear the hub. I'll remind you my opti is the 96-97 model and the shaft on the opti doesn't let me clear the hub(its aftermarket with circle flange) . Any tips on how to squeeze it out without pullin the hub?

Last edited by 97sswcubes; 06-16-2018 at 12:17 PM.
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Old 06-16-2018, 01:35 PM
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Re: 97 lt1 missfire on #7 i need help!

If it is an aftermarket hub (not sure it was ever mentioned), you'll have to pull it. The stock hub you don't.
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Old 06-16-2018, 01:48 PM
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Re: 97 lt1 missfire on #7 i need help!

Well i had to pull the hub a few centimeters forward to get the optispark off the engine. Optispark internals look dry and new. Only thing i could notice is the burn on the post in the cap. One of the post was just getting spark, up top. The rest had the burn lower. Could it be the rotor is crooked or the ring that turns the rotor? Here's a picture

Id appreciate further advice
97sswcubes Left burn is lower from the top
Right is almost at tip of post. I wonder if that post could be #7?

Last edited by 97sswcubes; 06-16-2018 at 02:09 PM.
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Old 06-16-2018, 01:52 PM
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Re: 97 lt1 missfire on #7 i need help!


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Old 06-16-2018, 02:55 PM
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Re: 97 lt1 missfire on #7 i need help!

Originally Posted by 97sswcubes View Post
Hey guy i thought you said i didn't have to remove the hub?
Im there now and the opti doesn't clear the hub. I'll remind you my opti is the 96-97 model and the shaft on the opti doesn't let me clear the hub(its aftermarket with circle flange) . Any tips on how to squeeze it out without pullin the hub?
Apparently you think this “guy” is stupid for not knowing you have non-stock parts. I guess you covered that detail in the “...etc. etc. ....” part of your first post. How stupid of me not to realize that “etc. etc.” translated to “aftermarket (damper) with circle flange”. And yes, I am familiar with the details of a vented Opti and it’s drive mechanism.... but thanks for reminding me. If you took the time to look at the Shoebox photo of the 3-jaw puller I linked in my response to your question about pulling the hub, you would have realized I was talking about a stock component.

In the future, I'll ignore your posts, to avoid irritating you.

SMH....
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Old 06-16-2018, 03:15 PM
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Re: 97 lt1 missfire on #7 i need help!

Originally Posted by Injuneer View Post
Apparently you think this “guy” is stupid for not knowing you have non-stock parts. I guess you covered that detail in the “...etc. etc. ....” part of your first post. How stupid of me not to realize that “etc. etc.” translated to “aftermarket (damper) with circle flange”. And yes, I am familiar with the details of a vented Opti and it’s drive mechanism.... but thanks for reminding me. If you took the time to look at the Shoebox photo of the 3-jaw puller I linked in my response to your question about pulling the hub, you would have realized I was talking about a stock component.

In the future, I'll ignore your posts, to avoid irritating you.

SMH....
Hey guy, obviously you misinterpreted my writing and flew in a different direction..
I was literally hands on workin on taking apart the car then realized i couldn't budge the opti off with the hub on. Then i immediately replied to you and quoted you on i could remove the opti with the hub still on. After i looked up other opti removals and realized i have an aftermarket hub. Not stock eared hub. I had just replied to you in a hurry hoping i would get a quick response and get the damn opti off my car.
No need to get upset and i apologize for not elaborating on all my aftermarket parts. I too forgot i had an aftermarket hub.

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Old 06-16-2018, 08:35 PM
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Re: 97 lt1 missfire on #7 i need help!

Originally Posted by 97sswcubes View Post
Left burn is lower from the top
Right is almost at tip of post. I wonder if that post could be #7?
This will get you in the ballpark of what terminal is where on the cap:

http://shbox.com/1/opti_cyl.jpg
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Old 06-17-2018, 11:04 AM
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Re: 97 lt1 missfire on #7 i need help!

Originally Posted by shoebox View Post
This will get you in the ballpark of what terminal is where on the cap:

http://shbox.com/1/opti_cyl.jpg
Exactly what i needed thanks.
Called sumit and they shipping me another opti and see how it goes.
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