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Join Date: Jun 2007
Location: Danville, IN
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Well I reset the timing and it's good now, it seems to be a bit more peppy. I have the vacumn hoses ordered and will replace them when they come in. When I'm looking at the #3 and #4 plugs to see if they're running lean, what signs am I looking for? I took off that cardboard piece from in front of the rad and it does seem to stay right around 1/2 on the gauge if I stay in town. As soon as I get on the highway it starts rising slowly between 3/4 and hot. Then when I get back on city roads, it goes back to around the half mark, which is still too high. You said something about the mixture maybe being off, how do I check it or correct it?
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Michael
1977-1/2 924
"Better than tea with Miss McGill!!" Go Wings!
Old 07-20-2007, 07:47 AM
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The easiest way for you to check the mixture, assuming you don't have access to a tailpipe sniffer, is to read the plugs. Maybe someone can provide links to pics (or find 'em on Google), but basically the plugs should be caramel colored. If they're dark to black, you are running rich; if tending to white, you're lean.

To adjust, you need a long-T-handled 3mm allen wrench, fits in the hole in the top of the air flow meter between the fuel distributor and rubber boot. Unscrew to lean, screw in (clockwise) to richen. Move by very small amounts - 5 deg, really. When tuning the racecar, we'll typically dial it in in increments of 2 degrees.

There is another way to baseline, but let's see what your plugs look like first.
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Old 07-20-2007, 08:55 AM
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Ok I'll try it this weekend. But how do I tell when I have the right mixture, will I hear a difference in the engine? And if the mixture is off, are they typically off by much, because turning the screw 5 deg isn't a whole lot. I just don't want to make it worse. I have also ordered a new temp sensor just to be safe, the one on it now came with the rebuilt engine. Oh, by the way, I replaced the entire ground wire from the sensor and the gauge still bounces at idle
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Michael
1977-1/2 924
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Old 07-20-2007, 12:08 PM
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Correct, it is a very sensitive adjustment - that's why it would be helpful to know what your plugs look like, since you have no prior experience setting the mixture.
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Old 07-20-2007, 04:13 PM
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Michael,
From reading the many posts you have gotten, I can see that everyone has an opinion (and thats ok) However, you may get confused so please try an area, one at a time (your choice) such as tuning or system pressure or... But remain in one area and rule out all tests in that area before going to another. When you get finished, please let us know of the solution.
Gordon
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Old 07-21-2007, 08:12 PM
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Not sure what the latest on this is... it may be appropriate to try swapping out the t-stat... was that new with the new engine, or no? Some have run into problems with replacements...
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Old 07-23-2007, 05:04 AM
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Didn't get much done this weekend, too many Labatts on the lake. I did put a new t-stat in last week. I went with a 82 deg one. Probably won't get to play again til Wed, Buffett comes here tomorrow! I'm hoping the new vac lines and temp sender comes in today, will keep you posted. How will I tell if I have the mixture correct? Should I clean/replace the plugs and check them in a few days after driving or is there a way to check right after I adjust the mixture? Thanks for all the help guys!
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1977-1/2 924
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Old 07-23-2007, 05:53 AM
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That's cool - it's important to take a break every now and then!

You'll need to drive the car a bit, get the plugs up to temp, before you can see the results of mixture adjustment. Other than that, it takes practice - I do it by ear, often, just the way the car revs up.
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Old 07-23-2007, 09:33 AM
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That's cool - it's important to take a break every now and then!

You'll need to drive the car a bit, get the plugs up to temp, before you can see the results of mixture adjustment. Other than that, it takes practice - I do it by ear, often, just the way the car revs up.
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Old 07-23-2007, 09:33 AM
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Well I switched out the temp sensor and the temp now doesn't go above 1/2, even after driving for a hour on the highway. It's the one from my old engine but I still plan on replacing it with a brand new one when it comes in. At least now I'm seeing some results!! My new vac lines came in and I'll replace them tomorrow along with the ceramic balaster thing on top of the radiator, then my fan will work after I shut off the engine. Thanks for all the help but I gotta go get my 5 gal of margaritas mixed up, Buffett is today!! I'll check back in when I get the rest of the stuff switched out.
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Michael
1977-1/2 924
"Better than tea with Miss McGill!!" Go Wings!
Old 07-24-2007, 06:25 AM
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Well, somebody must've gotten the sensor out of synch with the gauge...

Good to hear - I don't blame you for taking a break after fighting through all that!
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Old 07-25-2007, 09:12 AM
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Hey Vaughn and Gordon-
Thanks for all the help, I just replaced the temp sender this morning with a brand new one and the temp hasn't even gotten above 1/4 on the gauge! And it doesn't bounce anymore either!! It seems to be running very good but I'm still going to replace all the vacumn lines today and see how that affects everything. Thanks again for all your help, you guys got me back on the road again, confidently! Well, until something else breaks....
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Michael
1977-1/2 924
"Better than tea with Miss McGill!!" Go Wings!
Old 07-30-2007, 05:22 AM
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