Cascade Crew

scott in wa. · Posted: Wed Feb 28, 2007 7:12 am Post subject: not running again

Well, the car is not wanting to run again.
Same thing as before, about two months ago.
Thought it was MSD, looked at battery voltage, computer, chip.
Then the car just started running like a race car.
It was running sweet.

Then bam yesterday.....spiting and sputtering, then nothing,
I hate intermittent problems.......Maybe I can blame this on the hit and run thing when the adjuster comes out????LOL….
So we will be looking at all this stuff again this weekend. We put new plugs in last night. No change.
Old plugs looked great, or way better than the ones we took out 2 months ago.
This is a bummer.
But hey. Its the price one pays, when building a hot rod, its takes a while to rub out all the wrinkles.

Crap

Scott

305 302eater · Posted: Wed Feb 28, 2007 11:57 am Post subject:

My friends 89 I-ROC had that problem. It ended up being the ignition module. Then later the car did it again and he tried to replace a bunch of stuff computer and everything, then i told him to take his chip out and put the stock one back in. Solved the problem. Just my two cents.

scott in wa. · Posted: Wed Feb 28, 2007 12:41 pm Post subject: yep

Ya I did the new chip thing last time as well.
Didn’t really know what changed things last time but will be looking at everything once more.
How about a bad rotor cap? Its only 2 month old....Put a new one on last time as well, MSD Brand. Is there a better one???

Thanks

Xophertony · Posted: Wed Feb 28, 2007 12:50 pm Post subject:

the MSD came with a new ignition module right? if not i would deffinatly test that. might want to test it anyway.

is it getting spark?

Twilightoptics · Posted: Wed Feb 28, 2007 10:11 pm Post subject:

Yeah, when it does the problem what's it doing? Spark/fuel etc. Check all the basics.

scott in wa. · Posted: Thu Mar 01, 2007 7:07 am Post subject: problem

Backfiring once in a while.
When cranking no start, but black smoke coming out of exhaust.

Ignition module? you mean the thing on the back of the distributor???
No its not new, its the old one.
Is there a really good one we can buy???

What about a really good cap???

Will be working on it this weekend, after work.
No codes either, weird...

it did this once before

Scott

305 302eater · Posted: Thu Mar 01, 2007 9:11 am Post subject:

Ya i would try and get a new ignition module. Its the thing under the cap and sticks out the back. I got a oem replacement from west bay for mine. Just wanted to get a new one before the old one goes out. Thats what solved my friends problem with his iroc. Hope it works for you. Its a easy fix. Good luck

Twilightoptics · Posted: Thu Mar 01, 2007 9:44 am Post subject:

Most likely there wouldn't be black smoke from the ignition module.

Crane sells ones for a decent price at summit or there is the Delco module that's good too.

MSD cap is best.

Have you checked what the sensors read? Almost sounds like the coolant temp sensor for the engine went out. It would read something like -45deg all the time so it just dumps fuel in.

Check fuel pressure too.

Did the car normally puff black smoke out while cranking?

305 302eater · Posted: Thu Mar 01, 2007 9:56 am Post subject:

Wouldn't lose of spark cause the engine to over fuel and in turn cause black smoke?

scott in wa. · Posted: Thu Mar 01, 2007 9:59 am Post subject: nope

Nope never puffs smoke, when its running, just during the bouts with this problem. did this about two months or so ago .

Fuel pressure good, we have a gage mounted on the fuel rail.
Didn't check the sensors yet, will tonight if we have time.
That could be the problem, hit and miss signal maybe.

Should be a code, but non there.

How about arcing in the cap??? accross many terminals???

scott

chevymad · Posted: Thu Mar 01, 2007 10:38 am Post subject:

When the coolant sensor goes open the ecm sees -45*. This doesnt set a code. You'd think it would, but i've never seen one set. Happens alot to gm vehicles. I've replaced quite a few of them on tbi pickups. Usually the truck won't start. Alot of times the harness is bad that plugs into the sensor as well. You can buy the sensor with/without the harness pigtail.

BigDaddyVu · Posted: Thu Mar 01, 2007 1:00 pm Post subject:

http://www.msdignition.com/forum/forumdisplay.php?f=8

Twilightoptics · Posted: Thu Mar 01, 2007 4:45 pm Post subject:

Haven't see an MSD arc across the cap.

one way to find out is to put a timing light on each plug wire and while it's having it's fit, if the timing is pretty consistant (note that the computer will try to make timing adjustments while it's having a fit) you should be okay. If it arcs you'll see erratic spark somewhere.

BigDaddyVu · Posted: Thu Mar 01, 2007 5:42 pm Post subject:

did you install that diode that came with you msd, its used on 5 and 7 pin modules.

scott in wa. · Posted: Thu Mar 01, 2007 5:47 pm Post subject: HUH???

diode???
Nothing came with it??

Digital 6 somthing box

Diode?????

Twilightoptics · Posted: Thu Mar 01, 2007 6:54 pm Post subject:

Yeah, what diode? I've never heard of a diode used with MSD boxes. Even the instructions don't show any diode when hooked to EFI distributors.

BigDaddyVu · Posted: Thu Mar 01, 2007 7:00 pm Post subject:

Read instruction on on page 17. http://static.summitracing.com/global/images/instructions/msd-6420.pdf

BigDaddyVu · Posted: Thu Mar 01, 2007 7:04 pm Post subject:

what style of hei are you running?

scott in wa. · Posted: Fri Mar 02, 2007 5:29 am Post subject: hei

Small cap dist.
Jacobs ultra coil

Twilightoptics · Posted: Fri Mar 02, 2007 9:10 am Post subject: