88v8 Ivor Duarte Gloucestershire UK (1041 posts) Registered: 02/11/2010 04:29AM Main British Car: 1974 Land Rover Lightweight V8 |
Tacho mystery
My 327 has a rev counter, fitted from new. Runs off the coil neg.
Never seemed that accurate although as I (still) haven't driven the car yet, hadn't paid too much attention. I'm sitting in the car yesterday running the engine, hoping I've got to the end of the problems and can take it out for a run, but no. As I rev up to about 2,000 there's a bad misfire. Shakes the engine. If I try to rev through it, I can and it clears, but while it's missing it's pretty bad. Then I notice that the rev counter stops rising at the point where the misfire starts, and when it gets bad the needle goes all the way back to zero. I tried disconnecting the rev counter in case it's somehow causing a problem, no change. Misfires hot or cold. Timing is OK plugs are new, firing order is right, points gap is OK. Original coil & ballast, the coil impedance is OK for the ballast. Fuel pressure is correct, I set the wet fuel level. I'm inclined to replace coil and ballast, but I don't like randomly replacing things. So, do you think the rev counter is trying to tell me something about the ignition, or is it just faulty? Ivor |
kstevusa kelly stevenson Southern Middle Tennessee (985 posts) Registered: 10/25/2007 09:37AM Main British Car: 2003 Jaguar XK8 Coupe 4.2L DOHC/ VVT / 6sp. AT |
Re: Tacho mystery
Perhaps a check to insure the GROUNDS are secure. Battery(rear) to body, body to drive train and drive train back to body at engine. Brit cars tend to have a few glitches and most I've had were related to the Poor Grounds, earths .
|
BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6468 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS |
Re: Tacho mystery
That symptom is pretty typical for dirty points or coil breakdown. Possibly condenser. The tach is trying to tell you it needs a tune-up.
Jim |