nother day nother problem (Page 1/3)
cartercarbaficionado APR 28, 01:01 AM
actually got to put mileage on my 88 today and yesterday ~250 miles worth and I left it idling while eating in the car and it stalled and would not restart until it sat for a but, which was weird but the weirder part is now I have a huge stumble at 3k rpm and absolutely no power
jelly2m8 APR 28, 02:24 AM
Ignition Module possibly?


Usually those go bad and the car will not start till cooling off and then work again until it warms up

[This message has been edited by jelly2m8 (edited 04-28-2024).]

cartercarbaficionado APR 28, 04:38 AM

quote
Originally posted by jelly2m8:

Ignition Module possibly?


Usually those go bad and the car will not start till cooling off and then work again until it warms up



I would think so but I messed around with the wiring and tps and it started running a bit better and when revved up spun up to 8k rpm so I'm guessing my cheap self should probably replace sensors and throw a gm icm in from a tested dist
buddycraigg APR 28, 04:42 AM

quote
Originally posted by cartercarbaficionado:
spun up to 8k rpm


You probably should not do that.
cartercarbaficionado APR 28, 04:47 AM

quote
Originally posted by buddycraigg:

You probably should not do that.


yeah I did not expect the engine to move quite that fast from 2 full throttle blips normally this engine barely sees 5k because it's overheating or doing weird stuff like oh idk. blowing up its shift cables so I was suprised to learn this ecm has no cut off rpm and that the engine didn't throw a rod
82-T/A [At Work] APR 28, 09:14 AM

quote
Originally posted by cartercarbaficionado:

actually got to put mileage on my 88 today and yesterday ~250 miles worth and I left it idling while eating in the car and it stalled and would not restart until it sat for a but, which was weird but the weirder part is now I have a huge stumble at 3k rpm and absolutely no power




I assume you don't have a check-engine light, and that there are no codes stored?

My first thought is something in the ignition. It's possible, like Jelly said, the Ignition Control Module was overhearing. I've never owned an 88, but if I'm not mistaken, they eliminated the trunk fan that's supposed to cool the coil area. Does it get insanely hot in there? May want to consider wrapping your headers in "header wrap" ... that helps a little bit with power (makes the cat work better) and really, really cuts down on heat in the engine compartment.
87GT3800SC5SPD APR 28, 12:58 PM
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

[This message has been edited by 87GT3800SC5SPD (edited 04-28-2024).]

olejoedad APR 28, 03:40 PM
I doubt you hit 8 grand at the crank.
More likely overshoot on the tach needle.
olejoedad APR 28, 05:14 PM
Before you start throwing money at this problem, scan the ECU and get some data so you know what's going on.
cartercarbaficionado APR 28, 08:56 PM

quote
Originally posted by 82-T/A [At Work]:
I assume you don't have a check-engine light, and that there are no codes stored?

My first thought is something in the ignition. It's possible, like Jelly said, the Ignition Control Module was overhearing. I've never owned an 88, but if I'm not mistaken, they eliminated the trunk fan that's supposed to cool the coil area. Does it get insanely hot in there? May want to consider wrapping your headers in "header wrap" ... that helps a little bit with power (makes the cat work better) and really, really cuts down on heat in the engine compartment.


0 check engine light or codes other than the Start and stop, last codes I had went away after I adjusted the tps and kind of came on while idling lower and lower but didn't store a code.
my engine bay doesn't actually get that hot anymore, i can't touch the engine for more than a few seconds but it's not like my 95 gtp that will litterally take skin off in less than a second
will probably make some lower intake ducts to funnel air into the engine bay to keep it cooler and maybe clear coolant better when it inevitably blows a hose up again