Distributor > Timing + Advance Issues, please help!
Hi everyone... my car is a pretty special one... mix of different shit from different cars
You can read my complete build here: https://www.rx7club.com/2nd-generation-specific-1986-1992-17/my-13b-na-build-thread-945483/ In a nutshell, it's the following:
Now to the problem... the car was running great, had plenty of power... sometimes had a tad more, some other times a tad less... but overall pretty good. About a week ago, my brake booster craps out. The brake master cylinder was leaking a bit into it, eventually destroying it. So I took it to a shop and they rebuilt it. Good. Now... I installed the rebuilt brake booster... no issues. I start the engine... no issues. Now... I take it for a spin, and the car feels like it has about 50% de power it had before... idles just fine, but I get sluggish acceleration, pretty aggresive backfires, RPMs going up in an irregular manner, bucking, etc. I immediately assumed this was some kind of ignition issue, so I checked timing with a timing light. Strangely, no issues there... car idles at about 1200rpm, and I get 5* L/20* T (stock). The car still runs like shit though. So... what now? Since the only thing I did for the car to run like this was fixing the brake booster... I thought it may be some sort of vacuum-related issue. Maybe the vacuum advance or something was working semi-properly with the leaky/broken booster, and the fixed one messed everything up for some reason... So I disconnected the 2 vacuum hoses at the distributor and... the car runs better. Not 100% better, but I would say... 85% better. Now... why would this happen? What should I do? Thanks a lot for taking the time to read, and I look forward to any feedback you might contribute with :) |
First... to correct my previous post, Leading is set to 0º, and Trailing is at +20º
Engine's idleing at about 1100rpm, TPS is now set to 0.98k Ohm... was at about 0.8 So I was just checking timing again... and I noticed this... With the distributor vacuum hoses disconnected, I was able to see the timing advancing progressively when pushing the throttle. Now... with the vacuum hoses connected I tried the same thing... and I noticed that timing advanced VERY abruptly... I just feathered the throttle linkage and I could see timing going from 0º to about -12º instantly... in about just a 100rpm difference (yes, a hundred). Any ideas? :( |
Did u ever figure out what the problem was?
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