Defender Source Forum banner
1 - 20 of 23 Posts

·
Premium Member
Joined
·
89 Posts
Discussion Starter · #1 ·
I just installed a new Pertronix distributor on 1992 RRC. its NOT the expensive performance one, its the direct replacement one...anyways, after installing it i adjusted the timing to 6* BTDC, but when i check it whit a timing light it looks erratic and shifts up and down (vacuum advance disconnected) when I connect the vacuum advance I cant rev the engine. If the engine is revved past 1,000 RPM it will begin to miss and backfire. Has anybody had any problems installing these distributors? Why would the vacuum advance cause it to miss and backfire? I was adjusting it all day yesterday and the only way i got it to run semi decent is with the advance disconnected and the timing still shifts a little...

-Gabe.
 

·
Premium Member
Joined
·
14,229 Posts
Ensure it's not 180 degrees off.
scratch that the truck wouldn't start if it was 180 out.

Are you sure the distributor you installed is a vacuum advance ?
Some distributors have a vacuum retard to idle down. The dwell being all over sounds like a bigger problem. I'd try loosening the distributor clamp and turning the distributor to find the sweet spot. I usually time cars by ear anyway.
 

·
Premium Member
Joined
·
14,229 Posts
I tried timing it by ear, but end up with the same problem timing shifts between 1 and 3 degrees in both directions...
if this a v8, a worn/stretched timing chain, something the early ones were known for, will make it damn near impossible to set the timing. Any idea if the timing chain and gears have been replaced ?
If you go to replace yours I'd suggest the Cloyes dual roller setup.
 

·
Premium Member
Joined
·
883 Posts
Sounds like you've got a couple of wires out of sequence. Check that firing order again.
 

·
Premium Member
Joined
·
89 Posts
Discussion Starter · #11 ·
I have not contacted Pertonix yet. I wanted to make sure I did as much as I can before resulting to that. I checked the air gap on the new distributor and it was large. Like over 0.040" I used a plastic gauge to adjust it to 0.010" which made the engine start, but now i have the timing issue...
 

·
Registered
Joined
·
1,207 Posts
I should have been more clear regarding the vac hose. I'm referring to the connection on the vacuum advance.... there's two options. You want the outside one. Just trying to rule out simple things.
Mechanical advance working?
Did you check that the timing is advancing with throttle?
 

·
Registered
Joined
·
1,207 Posts
I have not contacted Pertonix yet. I wanted to make sure I did as much as I can before resulting to that. I checked the air gap on the new distributor and it was large. Like over 0.040" I used a plastic gauge to adjust it to 0.010" which made the engine start, but now i have the timing issue...
I'm wondering if the original air gap was proper. All of my searching shows it using a larger gap. Maybe your timing was way off & that's why you got a no start.

I'm also curious if your idle is steady or fluctuating causing 1-3º timing swing... or a vacuum leak.

All my curiosity is because I've been thinking of doing a Pertronix too.
 

·
Premium Member
Joined
·
89 Posts
Discussion Starter · #20 ·
I just got off the phone with a local Rover mechanic. he said they are plug and play. didn't go into a lot of detail, but said he hasn't had any problems with it. I will look at the whole ignition system this afternoon, try to trace vacuum or air leaks and see if i can get it steady.
 
1 - 20 of 23 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top