Timing woes, I wish I wish I hadn't killed that fish! |
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Timing woes, I wish I wish I hadn't killed that fish! |
mike_the_man |
Apr 22 2004, 09:07 PM
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#1
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I like stuff! Group: Members Posts: 1,338 Joined: 11-June 03 From: Regina, Saskatchewan, Canada Member No.: 809 |
Hi all,
My car was running like piece of poop recently (74 2.0L with F.I.), but backing off the timing a little made it run a fair bit better. Today I took it for a little drive, got it nice and warm, and decided to try and re-time it. It turns out that my timing was correct when it was running poorly, and now I'm very confused. I checked top dead center on the fan and on the fly wheel, as well as looking at the position of the rotor. Everything points to top dead center. I then put a new mark on the fan at 27 degrees as per the PP tech article. I also found the 27 degree mark on the fan, and it lines up with the mark that I made. When I rev my car up to 3500 rpm and set the timing to the 27 degree mark (I disconnected the vacuum hose from the dizzy) the car runs like crap. But if I set the static timing (not revving the car up, but setting it at idle) to 27 degrees, it seems to run pretty good. I'm totally confused. Could it be that the mechanical advance isn't working? Is there any way to test the mechanical advance? What would the symptoms be? I hope this all makes sense, and I'm sorry for the long post. Thanks for all ideas. A (IMG:style_emoticons/default/beer.gif) to the first person that gets it right. |
nebreitling |
Apr 22 2004, 10:38 PM
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#2
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Member Emeritus Group: Members Posts: 3,314 Joined: 26-March 03 From: San Francisco Member No.: 478 |
mike, did your car ever run great, or is this a recent thing? if it ran well before, than i would check:
-points (hell, just get rid of them and install pertonix/crane) -FI trigger points (this is my best guess for your problem) -FI wiring (make sure all your connections are kosher. one loose injector wire or similar and you'll be in troubleshooting hell) i doubt that it's a problem with the advance. are you plugging the advance hose(s) when you time the car? this can effect it a few degrees. of course, make sure that your rotor/cap are in good shape. just for shits and grins you may double-check TDC #1, just to make sure that your TDC/timing marks are correct. insert a dow rod into the #1 spark hole. when the piston is at the top of its stroke AND the valves for that piston are loose (i.e. adjustable), you are at TDC. adjust the valves while you're at it... 415PB: i'm sure you've heard the mantra before, but it sounds like a vacuum leak... good luck, nathan |
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