1986 L98 weird stuff
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
How'd you come to the conclusion that it's shot?
If it is, don't give up. I've seen a few posts on the Fourms where guys have had to return replacement ECMs a few times to get one that works okay.
Jake
West Point ROCKS!
If it is, don't give up. I've seen a few posts on the Fourms where guys have had to return replacement ECMs a few times to get one that works okay.
Jake
West Point ROCKS!
Thread Starter
Advanced
Joined: Apr 2009
Posts: 77
Likes: 0
From: Canisteo NY
Well the right hand injectors quit working again. The same thing as last time. Fuses good wiring good etc. Got another one different brand coming tomorrow morning.
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
I suspect one of them is shorting out, either to ground or to another injector wire, and is burning out the quad driver(s) in the ECM.
Jake
West Point ROCKS!
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Team Owner
Joined: Jan 2003
Posts: 20,315
Likes: 245
From: Summerland B.C. Canada
Sounds like wire short or an injector(s) is internally shorting and taking out the driver.How old are the injectors ??
Thread Starter
Advanced
Joined: Apr 2009
Posts: 77
Likes: 0
From: Canisteo NY
Not sure how old the injectors are. I believe my prom is fried too. It smells like it's burnt up. Got new ECM today and ordered hypertech prom. Have to wait 5 days for prom. How hard is it to pull complete harness from firewall to engine stuff so I can check everything. Any suggestions?
Maybe the prom was the problem from the beginning? It smelled the same way before I put new ECM in. What do you guys think?
Maybe the prom was the problem from the beginning? It smelled the same way before I put new ECM in. What do you guys think?
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Sorry, the best I can think of at this point is a wiring short somewhere.
How about this: Post all the numbers you have on your ECM and your PROM. Maybe someone who has a 86 can verify that you actually have the correct parts.
Jake
West Point ROCKS!
How about this: Post all the numbers you have on your ECM and your PROM. Maybe someone who has a 86 can verify that you actually have the correct parts.
Jake
West Point ROCKS!
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
I first turned the they to "ON" to check for any leak. When I saw none I cranked the engine to check for spray. This has to be done with care to prevent a fire.
Adjusting lifter preload (sometimes incorrectly referred to as "adjusting valves" is a different matter. I have the procedure I use that I can post if you need me to; let me know.
Jake
West Point ROCKS!
Thread Starter
Advanced
Joined: Apr 2009
Posts: 77
Likes: 0
From: Canisteo NY
Ok this car has aftermarket valve covers on it. On the left hand side there is a PCV valve. On the right hand side somebody put a breather filter in. No on the throttle body right hand side very top there is a hose connection there that is unhooked. I'm not sure if it is supposed to be coolant or vacuum that is supposed to go to the right hand valve cover. Anybody know or have pictures?
Thread Starter
Advanced
Joined: Apr 2009
Posts: 77
Likes: 0
From: Canisteo NY
As I said, it leads to the EGR switch that is right under the TB via a "U" shaped vacuum line. This switch gets vacuum from said port, and cuts/feeds it to the EGR valve at the appropriate times.
EGR switch is bolted next to thermostat housing below TB. That port under the TB goes to one of the two ports on the EGR switch below. The other port on the switch then feeds to the EGR valve under the plenum mounted on the center of intake base.
EGR switch is bolted next to thermostat housing below TB. That port under the TB goes to one of the two ports on the EGR switch below. The other port on the switch then feeds to the EGR valve under the plenum mounted on the center of intake base.
Thread Starter
Advanced
Joined: Apr 2009
Posts: 77
Likes: 0
From: Canisteo NY
Thread Starter
Advanced
Joined: Apr 2009
Posts: 77
Likes: 0
From: Canisteo NY
Please help
Ok so I believe this is part of my problem. This is fried and the connector is fried. Look at this.
Got a new one coming from Vette2Vette. Of course no parts store can get it even though they have good part numbers for it.
Next issue is. The CCV is not hooked up. What should I do here. Take a look at pics.
and this is what the PO put in
Got a new one coming from Vette2Vette. Of course no parts store can get it even though they have good part numbers for it.
Next issue is. The CCV is not hooked up. What should I do here. Take a look at pics.
and this is what the PO put in