nother day nother problem (Page 2/3)
cartercarbaficionado APR 28, 09:00 PM

quote
Originally posted by olejoedad:

I doubt you hit 8 grand at the crank.
More likely overshoot on the tach needle.


I would be doubting it but I've never heard this engine be that loud or take more than maybe 2 seconds to go back to what sounds like idle, that took 5 seconds and was loud enough to wake up my neighbor that's a quarter mile away which meant it was louder than his straight piped focus
cartercarbaficionado APR 30, 12:22 AM
starting to wonder if this thing just has a habit of destroying icms. if this one is dead or being weird thats....the 5th one? doesn't matter if I use thermal paste or not seemingly, they either last forever and run like crap or run great and die quickly
1985 Fiero GT APR 30, 06:18 AM

quote
Originally posted by cartercarbaficionado:

starting to wonder if this thing just has a habit of destroying icms. if this one is dead or being weird thats....the 5th one? doesn't matter if I use thermal paste or not seemingly, they either last forever and run like crap or run great and die quickly



If that is the case, I would be inclined to believe that there is something else that is malfunctioning that is killing the icms, the coil maybe.
cartercarbaficionado APR 30, 06:35 AM

quote
Originally posted by 1985 Fiero GT:


If that is the case, I would be inclined to believe that there is something else that is malfunctioning that is killing the icms, the coil maybe.


tested coil from a 1993 s10 blazer, only icm that had lived so far was a Delphi unit that idles poorly and has no power, I checked plugs and wires but I wouldn't be suprised if im dealing with a junk harness. I have my suspicions on the entire harness being completely messed up considering it used to run the same wether or not it had a tps
olejoedad APR 30, 09:10 AM
It is a relatively common practice with the 2.8's to add another ground wire from the engine block to the chassis.
I read about this years ago on this Forum and pooh-poohed the idea.
When I finally did do it, the engine ran better and idled better.

Just a thought.
theogre APR 30, 10:32 AM

quote
Originally posted by 87GT3800SC5SPD:
Ignition modules die from excessive heat. The automotive dielectric grease that is supplied with some ignition modules is not the best product to protect the ignition module from heat.

Thermal paste, that is used when installing computer processing units, is superior to dielectric grease for the transfer of heat from ignition modules or coil packs.

This link explains the use of thermal paste and the different types available. It is not expensive, especially when compared to the cost of ignition modules or coil packs that fail due to using dielectric grease or that are installed without anything to ensue good contact with a heat sink.

https://www.tomshardware.co...s/best-thermal-paste

While dielectric grease isn't the best... Ignore what Tomshardware & others in the "PC world." Most push High $ "grease" that just drain your wallet for little effect. Worse, Many push "liquid metal" crap that Actively "Eats" Aluminum. (They contains Gallium etc. that attack Aluminum.) If that gets on the Distributor on most engine will destroy the Dist & Al part(s) attach to it like Intake Manifold on Fiero V6.

Dielectric grease (Silicone Oil w/ Silicone Solids) help to dump heat but also keeps water out so doesn't "rust" there or on the screws to mount the module.
Any White Heat Sink "Grease" will do the job much better. (Silicone Oil w/ Zinc Oxide)
Gray HS "grease" like left over product from Dell etc to service PC MoBo are good too. Most here are Non Silicone oil.

⚠️ Warning: ICM "Heat problems" may have other problems making the module to run hot. So Adding HS "grease" often doesn't help much or at all.
https://web.archive.org/web...t/~fierocave/hei.htm

------------------
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)

The Ogre's Fiero Cave

[This message has been edited by theogre (edited 04-30-2024).]

theogre APR 30, 11:02 AM

quote
Originally posted by olejoedad:
It is a relatively common practice with the 2.8's to add another ground wire from the engine block to the chassis.
I read about this years ago on this Forum and pooh-poohed the idea.
When I finally did do it, the engine ran better and idled better.

Just a thought.

Just means Other Two Grounds from Block to Frame had problems & adding more wires can cause other problems because can make Ground Loops that causes big problems w/ ECM ICM etc.

Factory Installed...
1. Main Ground is often braided "strap" that can be replace/upgraded easy. Quick Example: www.dormanproducts.com/p-28495-60213.aspx
2. Secondary Ground just a big wire often attach between trans bell bolt & frame.

Either or very likely both have crap/rusty ends often bolted to the frame anywhere easy for factory worker to quickly screw w/ power tools.

Braided Grounds caries more Amps than similar normal wires. Don't replace that w/ normal wire.

OEM Battery Cables did not have small ground from Battery to Frame but many add it later when getting new ones. Even this can cause Ground Loops when the others above are Iffy.

clean/fix see https://web.archive.org/web...ierocave/ecmwire.htm
cartercarbaficionado MAY 01, 12:21 AM

quote
Originally posted by olejoedad:

It is a relatively common practice with the 2.8's to add another ground wire from the engine block to the chassis.
I read about this years ago on this Forum and pooh-poohed the idea.
When I finally did do it, the engine ran better and idled better.

Just a thought.


added 4 new grounds as I didn't trust the stock ones before this issue started, it had killed 4 icms before that though
cartercarbaficionado MAY 01, 12:26 AM

quote
Originally posted by theogre:

[QUOTE]Originally posted by olejoedad:
It is a relatively common practice with the 2.8's to add another ground wire from the engine block to the chassis.
I read about this years ago on this Forum and pooh-poohed the idea.
When I finally did do it, the engine ran better and idled better.

Just a thought.

Just means Other Two Grounds from Block to Frame had problems & adding more wires can cause other problems because can make Ground Loops that causes big problems w/ ECM ICM etc.

Factory Installed...
1. Main Ground is often braided "strap" that can be replace/upgraded easy. Quick Example: www.dormanproducts.com/p-28495-60213.aspx
2. Secondary Ground just a big wire often attach between trans bell bolt & frame.

Either or very likely both have crap/rusty ends often bolted to the frame anywhere easy for factory worker to quickly screw w/ power tools.

Braided Grounds caries more Amps than similar normal wires. Don't replace that w/ normal wire.

OEM Battery Cables did not have small ground from Battery to Frame but many add it later when getting new ones. Even this can cause Ground Loops when the others above are Iffy.

clean/fix see https://web.archive.org/web...ierocave/ecmwire.htm[/QUOTE]
factory ground is on the headbolt like it was when I took it apart but I'll probably move it to the block eventually
secondary ground i ran is going from dogbone mount on the frame side to the block
battery cable has the small ground connected
I'm not quite sure what it's doing with killing icms or stalling out only when idling and needing to sit for ~5 minutes or sometimes less than 5 seconds to restart as if nothing was ever wrong
cartercarbaficionado MAY 02, 09:39 AM
yeah Im at a loss. didn't want to start back up so I poked the map sensor connector and suddenly with a loud roar the v6 came to life like nothing was wrong. either my new map sensor sucks (maybe doesn't like being mounted upside down?) or the connector is just completely junk at this point
idle is down to ~1400 cold so I'm fine with that for now