Help!!!
Thread Starter
Advanced
Joined: Aug 2015
Posts: 60
Likes: 1
So at what point did it stop starting? Most mechanics would note distributor position if it was to be removed replace intake. It is easy to be one tooth off reinstalling distributor because oil pump drive rotates as distributor is lifted. When distributor is reinstalled it doesn't fit flush like it should. So then distributor is reinstalled so its flush and end up one tooth off. IDK how aftermarket EFI ties into distributor. With the OEM: if distributor 4 wire connector was unplugged the injectors would be inop. The ignition timing would be fixed at base and it would be possible to use a timing light to get an idea where timing is. The line on balancer and timing tab would have to be a bright color so they are easy to see. There will only be 1 flash every 2 revolutions. Even so it wouldn't show you if distributor rotor was facing #6 and not #1.
Large vacuum leaks like 5/16 or larger ports or hoses disconnected.
If plugs haven't been inspected they maybe fouled. It doesn't take long for an EFI to foul them during a no start situation.
To answer your question: "Yes" air will be pushed out spark plug hole even with valves open (overlap),but with considerably less force than valves closed (compression).
Large vacuum leaks like 5/16 or larger ports or hoses disconnected.
If plugs haven't been inspected they maybe fouled. It doesn't take long for an EFI to foul them during a no start situation.
To answer your question: "Yes" air will be pushed out spark plug hole even with valves open (overlap),but with considerably less force than valves closed (compression).
Thread Starter
Advanced
Joined: Aug 2015
Posts: 60
Likes: 1
Thread Starter
Advanced
Joined: Aug 2015
Posts: 60
Likes: 1
Does this sound reasonable to you? I have to check different things but seems like a place to start.
Oh, I talked to mechanic and he said when restabbing the distributor he did it both ways 0 and 180 just to try.....still wouldn't fire off with ether.
Le Mans Master
Joined: Sep 2013
Posts: 6,192
Likes: 750
From: near the thumb in the mitten
ICM provides reference pulse to ecm to trigger injector. ICM sends a reference pulse every time coil should spark. l98 is multiport FI meaning ecm triggers multiple injectors every time coil sparks. IF ecm doesn't receive pulse from ICM no fuel pulse to injector. Distributor 180 out would not necessarily has backfire; and it would really be an over fuel situation if it did. With no compression there is no "pop" unless if you have a large build up of fuel. Such as a box intake with fuel pooling in plenum a spark with intake valve open could cause intake to explode.
If timing is close engine should "fire off" with flammable aerosol.
If timing is close engine should "fire off" with flammable aerosol.
Last edited by Kevova; Jun 29, 2016 at 08:04 AM.
Thread Starter
Advanced
Joined: Aug 2015
Posts: 60
Likes: 1
ICM provides reference pulse to ecm to trigger injector. ICM sends a reference pulse every time coil should spark. l98 is multiport FI meaning ecm triggers multiple injectors every time coil sparks. IF ecm doesn't receive pulse from ICM no fuel pulse to injector. Distributor 180 out would not necessarily has backfire; and it would really be an over fuel situation if it did. With no compression there is no "pop" unless if you have a large build up of fuel. Such as a box intake with fuel pooling in plenum a spark with intake valve open could cause intake to explode.
If timing is close engine should "fire off" with flammable aerosol.
If timing is close engine should "fire off" with flammable aerosol.
ICM didn't work
Thread Starter
Advanced
Joined: Aug 2015
Posts: 60
Likes: 1
Wow, alot of issues fixed still no start.
#2 fuel pump not activating - limited fuel at motor from fuel pump #1 but second fuel pump not working - fixed working
Bad connection on coil/no spark - fixed spark cofirmed
Timing out 180 - fixed
Electric Spark Timing module - checked working
Ignition Control Module - replaced working
Confirmed getting injector pulse at each injector
Oil pressure sensor - cofirmed working over 4 psi on start up
Throttle Position Sensor - confirmed working .54
Idol air control sensor -working
Map sensor - checked confired working
Still need to confirm fuel pressure at fuel rail
Still need to verify injector flowing fuel
Anything we are not thinking about?
#2 fuel pump not activating - limited fuel at motor from fuel pump #1 but second fuel pump not working - fixed working
Bad connection on coil/no spark - fixed spark cofirmed
Timing out 180 - fixed
Electric Spark Timing module - checked working
Ignition Control Module - replaced working
Confirmed getting injector pulse at each injector
Oil pressure sensor - cofirmed working over 4 psi on start up
Throttle Position Sensor - confirmed working .54
Idol air control sensor -working
Map sensor - checked confired working
Still need to confirm fuel pressure at fuel rail
Still need to verify injector flowing fuel
Anything we are not thinking about?
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski