I'm going to say it's spark related. Scan it to see what cylinders are misfiring.

I would start by putting in AR104 plugs at .035 gap.

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Turbo 3800 E85 F23 5spd spec5
11.17@132.6

[This message has been edited by Justinbart (edited 03-05-2013).]

quote Originally posted by Justinbart: I'm going to say it's spark related. Scan it to see what cylinders are misfiring. I would start by putting in AL104 plugs at .035 gap.

It throws no codes, guess I got to get a tuner sooner or later, thanks

What brand spark plug wires are you using?

quote Originally posted by Darth Fiero: What brand spark plug wires are you using?

Crane Cams V8 cut to fit, 8.5mm, very nice set.

quote Originally posted by IanT720: Crane Cams V8 cut to fit, 8.5mm, very nice set.

I've used those for years on just about every swap I've done and never had a problem with them...

quote Originally posted by Darth Fiero: I've used those for years on just about every swap I've done and never had a problem with them...

I know you did, that's why I took them as a good recommendation! Haha, I'm very happy with them.

If you get stuck you could bring it up here and see if we can figure it out.

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Turbo 3800 E85 F23 5spd spec5
11.17@132.6

[This message has been edited by Justinbart (edited 03-05-2013).]

quote Originally posted by Justinbart: I'm going to say it's spark related. Scan it to see what cylinders are misfiring. I would start by putting in AR104 plugs at .035 gap.

X2, and a spare o2 sensor if you can get one on cheap.

quote Originally posted by nosrac: X2, and a spare o2 sensor if you can get one on cheap.

Alright just checked, I'm running Autolite 605's at a .60 gap. Which doesn't sound right from what I've been hearing from you guys... I will try the 104's. new o2 sensor btw. Thanks!

quote Originally posted by IanT720: Alright just checked, I'm running Autolite 605's at a .60 gap. Which doesn't sound right from what I've been hearing from you guys... I will try the 104's. new o2 sensor btw. Thanks!

605's maybe ok but you need to change the gap. You seem to be getting spark blowout but unsure what is causing it.

How much boost are you making?

My blowout issue was due to fouling my plugs and o2 sensor because I used leaded race gas.

quote Originally posted by nosrac: 605's maybe ok but you need to change the gap. You seem to be getting spark blowout but unsure what is causing it. How much boost are you making? My blowout issue was due to fouling my plugs and o2 sensor because I used leaded race gas.

Gotcha, well I'm making stock boost, stock pulley. Well maybe a lil less due to the straight pipes. I run premium gas from the pump. After driving the car more today, it not the RPM that makes a difference, it's the Load on the engine. No problems in park, 1st, or kinda 2nd gears. In third it will miss once you put your foot down enough to hit 3k RPM. But in 4th and OD it will miss around 1500-2K RPM just because of the load increase. I can accelerate without miss but I have to manually downshift, so there's less LOAD on the Engine.

Again this just started one day... The day before it happened, I filled up my tank with gas, and installed a IAT Sensor (I wasn't running one up until this point). I already dumped a bottle of gas cleaner in, and filled up at a different station. Still no change. I also unplugged my IAT, and MAF but no change.

Autolite 605-new
8.5 Crane Cams Wires-new
No cat
IAT-new
O2-new
MAF-used
Coils-used
ICM-used
MAP-used
Fuel pressure good, BOV delete, EGR delete, EVAP delete (all retuned for)
No Codes still

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86 Fiero GTX project now tearing up the street, My build thread! 3800sc, interior, wheels, suspension and more! https://www.fiero.nl/forum/Forum1/HTML/089483.html

Sounds like you are losing spark at some point which could be due to too wide of gap on those 605's, a coil issue, or an ignition module issue.

Buy the bluetooth dongle and borrow a friends android device. You will never want to diagnosis a problem again without a scanner when you can see exactly what cylinder(s) are having problems.

http://www.amazon.com/Yongt...=8-7&keywords=elm327

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Turbo 3800 E85 F23 5spd spec5
11.17@132.6

quote Originally posted by IanT720: After driving the car more today, it not the RPM that makes a difference, it's the Load on the engine. No problems in park, 1st, or kinda 2nd gears. In third it will miss once you put your foot down enough to hit 3k RPM. But in 4th and OD it will miss around 1500-2K RPM just because of the load increase. I can accelerate without miss but I have to manually downshift, so there's less LOAD on the Engine.

My money is on a failing ICM. Mine acted up on Load too as I would get KR when cruising and trying to accelerate. I also got KR when going up a incline cruising along with the same RPM's.

I got a spanking new one off e-bay for $40.

Dayum they are....$27.50 now

http://www.ebay.com/itm/NEW...&hash=item589b79dc5b

[This message has been edited by nosrac (edited 03-06-2013).]

Stop blindly throwing parts at it!!!

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Turbo 3800 E85 F23 5spd spec5
11.17@132.6

quote Originally posted by Justinbart: Stop blindly throwing parts at it!!!

I haven't yet!!! Just a couple bottles of fuel injector cleaner which seems to be helping little by little. I did buy new plugs 104's but figure I will need them anyway, will install tomorrow. So I really just need to put it on a scope I guess. Only things left it seems are my Coil, ICM, Injector (I already replaced 2 btw due to them being stuck) or spark blowout but I will solve that with my new plugs maybe. So if the new plugs don't help, guess I got to fork down the cash to have it diagnosed.

quote Originally posted by nosrac: Sounds like Spark blowout?

Bingo!!!! My 605's were gapped at .60 but then when I ran crap gas I think it just fouled them enough to give me spark blowout. I installed 104's at a .45 gap and my problem is gone! It's back to running perfect! Thanks for all the help guys

This sounds alot like my problem.
Just started today on me.
Guess ill check the plugs.
Hopefully i have the same result!

Well too soon to celebrate I fixed my misfire but, as I was all happy I passed someone and my engine light came on... Driving to work today I slowed, then rolled a stop and got back on the gas and nothing happened then BAM it just slammed into gear, I pulled over thinking it popped a line because its done that before... Anyway nothing leaking, and it has the correct amount of fluid..
At work (Autozone) I jacked a scanner and pulled 4 Codes! Two were for the O2 Sensor (P0140,P1133), and the Other two were for the Transmission IMS (P1825,P1826) I can't imagine they're not related... I'm hoping the O2 caused the engine to run crappy and while shifting causing the PCM to read the Transmission Code, Plausible?
I'm just getting sick of this, It was a beast and ran beautiful... Oh well, I had a warranty on the O2 so I picked up a new one, will install and report. Why would I need a new O2 sensor when this one is 2 months old? Why would my Transmission act up? arghhh...

I started a new thread, maybe get some more input but, will monitor both. Thanks again guys.

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86 Fiero GTX project now tearing up the street, My build thread! 3800sc, interior, wheels, suspension and more! https://www.fiero.nl/forum/Forum1/HTML/089483.html

You don't have any exhaust leaks, do you?

quote Originally posted by Darth Fiero: You don't have any exhaust leaks, do you?

A slight one actually.

If the leak is close to the O2 sensor, even after it, it COULD possibly cause a problem. But not near as likely if it was between the engine and sensor.

I think at this point you should get some scan data to see exactly what cylinder or cylinders are misfiring.

Well anyway, I tested out a new MAF and it didnt help. My slight misfire has returned and on my way home from work to the mechanics shop none the less, it started doing a crippling misfire. It started to miss under no throttle, I couldn't go anywhere at all so I had to get a tow to the shop :/ it would miss even in park! Well the guys have my car now, hopefully they can figure it out.

quote Originally posted by IanT720: Well anyway, I tested out a new MAF and it didnt help. My slight misfire has returned and on my way home from work to the mechanics shop none the less, it started doing a crippling misfire. It started to miss under no throttle, I couldn't go anywhere at all so I had to get a tow to the shop :/ it would miss even in park! Well the guys have my car now, hopefully they can figure it out.

quote Originally posted by nosrac: My money is on a failing ICM. Mine acted up on Load too as I would get KR when cruising and trying to accelerate. I also got KR when going up a incline cruising along with the same RPM's. I got a spanking new one off e-bay for $40. Dayum they are....$27.50 now http://www.ebay.com/itm/NEW...&hash=item589b79dc5b

Something in the fuel system may still be fouling your plugs.

quote Originally posted by nosrac: Something in the fuel system may still be fouling your plugs.

I'm thinking this maybe the case, I'm leaning towards injector. Just I have know way of telling what cylinders are the problem, hence taking to a shop. I will probably end up fixing it myself once I have the diagnoses complete.

Alright well the shop deemed the coil 3-6 was bad and had a "crack". I just did the work myself of course but when I yanked off the bad coil, I couldn't find the crack, and it didnt solve my problem at all. So called them back and they should get me in Monday :/

quote Originally posted by IanT720: Alright well the shop deemed the coil 3-6 was bad and had a "crack". I just did the work myself of course but when I yanked off the bad coil, I couldn't find the crack, and it didnt solve my problem at all. So called them back and they should get me in Monday :/

I don't know how you determine a coil or ICM is bad besides swapping them out.
I took my ICM to Oriley's as they had a machine to check if your ICM was good but it didn't tell me anything.
I knew it was bad when I swapped it out and all my problems went away.

Was that the cylinder(s) it was misfiring on?

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Turbo 3800 E85 F23 5spd spec5
11.17@132.6

Alright it is completely fixed now So anyway... The stutter under load was caused by the bad coil, they where right about that. However when I brought it home my engine light was on, and I scanned and got a misfire on 3. Anyway I looked and my plug wire was off the plug! So when they diagnosed it they said the coil was bad. That's all. When I was driving it to the shop and it got dramatically worse that's because the plug wire came off! They didn't even check it! So yes they were right about my coil causing the stutter but, that didn't have anything to do with the fact that I had a crippling misfire due to the wire coming off! I talked to the manager, and he had a nice chat with the mechanic that was "diagnosing" my car. Like your checking for a misfire but didn't even make sure the plug wires are connected!? Anyway with the plug wire re-attached, and a new coil, she runs beautiful and has all the power she used to have. I really appreciate the advice, sorry to drag this out so much.

quote Originally posted by Justinbart: If you get stuck you could bring it up here and see if we can figure it out.

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Turbo 3800 E85 F23 5spd spec5
11.17@132.6

quote Originally posted by Justinbart:

Man you need to check your PM's, she's rock solid now

quote Originally posted by IanT720: Man you need to check your PM's, she's rock solid now

You have never PM'd me.

Oh, guess it didnt send or something (usually use my phone). Anyway I thought that was a really cool offer, and that I've been wanting to hangout with you for a bit now, just didnt know how to ask. Also I did take you up on your offer but you never responded, probably because you never saw this message haha. That's all.