 V8 Tachometer, Sneaky little brat |
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| drive-ability |
 Feb 23 2010, 10:50 PM
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Senior Member  Group: Members Posts: 1,169 Joined: 18-March 05 From: Orange County, California Member No.: 3,782  |
I did tune-up and driveability for over 20 years within GM dealers. I had always known a tachometer can cause ignition problems but never had one cause any problems at work.
I'm sure you have figured out my 8 cylinder converted 914 unit was causing me problems. I had some misfire issues intermittently, always the best kind of failure. Well it started to really miss, brake down even at light throttle today. I decided to pull over and pull the plug, but I had the wiring sealed up tight and couldn't remove the wiring at the coil. The great thing about a 914 is you can pull the gauges right out. I disconnected the tack wire and it ran perfect. |
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| Andyrew |
Feb 23 2010, 11:04 PM
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Spooling.... Please wait Group: Members Posts: 13,376 Joined: 20-January 03 From: Riverbank, Ca Member No.: 172 Region Association: Northern California 
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QUOTE(drive-ability @ Feb 23 2010, 08:50 PM)  I did tune-up and driveability for over 20 years within GM dealers. I had always known a tachometer can cause ignition problems but never had one cause any problems at work. I'm sure you have figured out my 8 cylinder converted 914 unit was causing me problems. I had some misfire issues intermittently, always the best kind of failure. Well it started to really miss, brake down even at light throttle today. I decided to pull over and pull the plug, but I had the wiring sealed up tight and couldn't remove the wiring at the coil. The great thing about a 914 is you can pull the gauges right out. I disconnected the tack wire and it ran perfect. Weird. Coil or HEI? |
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| drive-ability |
Feb 24 2010, 12:27 PM
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#3
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Senior Member Group: Members Posts: 1,169 Joined: 18-March 05 From: Orange County, California Member No.: 3,782 |
QUOTE(Andyrew @ Feb 23 2010, 09:04 PM) QUOTE(drive-ability @ Feb 23 2010, 08:50 PM) I did tune-up and driveability for over 20 years within GM dealers. I had always known a tachometer can cause ignition problems but never had one cause any problems at work. I'm sure you have figured out my 8 cylinder converted 914 unit was causing me problems. I had some misfire issues intermittently, always the best kind of failure. Well it started to really miss, brake down even at light throttle today. I decided to pull over and pull the plug, but I had the wiring sealed up tight and couldn't remove the wiring at the coil. The great thing about a 914 is you can pull the gauges right out. I disconnected the tack wire and it ran perfect. Weird. Coil or HEI? I am running Edelbrock tune port injection, just like on the mid-late 80s Camaro and Corvette. It has a coil and a signal amp. I have seen a lot of tachometers react to a bad plug wire etc but this was different, it would gain rpm when the engine wasn't . Maybe there is a root cause still laying in wait like the signal amp which may have a week signal, at this point I don't know... I am going to connect another tachometer. |
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