softouch, foureyedpride.com member "xctasy" said something about the cam walking on the later roller cam motors (89-04 ?). I'm not sure what he means there.
I don't know what it means either.
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You seem to suggest the 5.0L eccentric will swap over to the 3.8L, yes ?
don't know if it will work or not. Just threw it out as a possibility.
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Next, I'm still not certain what you all are talking about in reference to "balace shaft". I'm guessing some 3.8L are internally balanced and some are not ? My link on FEP.com mentions a weight on the shaft. I'm just not familiar with style balancer.
Some 3.8L engines have a balance shaft. They have a gear on the front of the cam shaft that drives the balance shaft. The shaft runs parallel to the cam shaft and rotates in the opposite direction. They seemed to be only used on FWD cars. If you are going to try to use one of the newer roller cam engines I recommend picking one from a RWD car.
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Last, from me buttstuffyzing all these comments, I think its safe to say that all 82-88 will drive the mechanical pump without any extensive modifications. All that needs to be done is cutting a hole in the timing cover on the 84-88 to fit the pump arm to the eccentric. Is everyone in agreement ?
Not the 88 make that 82-87. I would not be surprised if the pump hole is still in all of these 82-87 engines.
From the '94 T-Bird shop Manual 3.8L V6: RWD, Roller Cam, No Balance Shaft, Sequential Multiport Fuel Injection, Injectors in the Head above the Intake Valve,, Removable distributor drive gear on front of the cam shaft, Part # 6255 Bolt/washer on end of cam shaft, Part # N806049-S2
Posting some pics from the 84 Shop Manual. They still made the Carb version of the 3.8 V6 in 84 & 85 for sale in Canada. The mechanical fuel pump and the distributor are in the timing chain cover (they call it the front cover). The pump actuating eccentric is part of the cam shaft. Not a bolt on like the V8s. Makes sense they would make a cover for the pump hole when they were making the same engine for the CFI version. How long the actuating eccentric stayed on the cam shaft is another question. Note: Click pic corner arrow to make more readable.
After re-reading the whole thread, your fuel pressure checks in post #9 indicate the regulator has vacuum and is working fine. Sorry, I'm an old coot and can't remember what I read back in June.
Did you remove the vacuum to the thermactor solenoids? If so, maybe you inadvertently also removed the vacuum to other stuff. MAP sensor, fuel pressure regulator etc.
The smog pump (thermactor) system not working will not cause your problem. Is it possible your smog delete procedure screwed up some other systems? Give us the details of your smog delete and maybe we can spot something.
Yes, running rich can cause the cats to overheat and eventually ruin them.
Your idea that the O2's getting carboned-up and causing the EEC to dump in more fuel, I'm having trouble with that theory. The O2 measures the difference in oxygen content between the exhaust and the ambient air. A big difference means rich and a small difference means lean. If the sensor is carboned over so it can't sense anything, this would be a big difference and the EEC would cut back on the fuel.
KOER does change the idle speed as part of it's tests.
Check your fuel pressure. The no vacuum pressure is 39 psi.
Did you stop the KOER before it finished? It post the engine code, 4 for 8cyl engine, then runs the tests. If the tests found no problems it should have posted code 11.
You will be "over fueling" if the vacuum is not getting to the fuel pressure regulator. As the vacuum goes up, the fuel pressure is supposed to go down.
Code 18 R SPOUT c°ircuit open during self test (Check the jumper plug) Code 18 M Loss of signal from coil negative, Ignition diagnostic monitor. Or spout grounded.
code 21 O&R ECT out of test range. To pass test, coolant temp must be: KOEO- 50° F to 240° F KOER- 180° F to 240° F Code 41 R Right O2 sensor shows lean Code 41 M Right O2 sensor not switching (stays lean for 15 seconds or more) Code 42 R Right O2 sensor shows rich Code 42 M Right O2 sensor not switching (stays rich for 15 seconds or more) Code 91 R Left O2 sensor shows lean Code 91 M Left O2 sensor not switching (Stays lean for 15 seconds or more) Code 92 R Left O2 sensor shows rich Code 92 M Left O2 sensor not switching (Stays rich for 15 seconds or longer)
I was too quick to jump on the ECT as your cause of running rich. First we have to sort out when you got the codes. The codes can have different meanings depending on when you got them. For example, if you only got the 21 code from KOER, it means you didn't warm up the engine before running the test.
KOEO (Key On Engine Off) Memory KOER (Key On Engine Running)
KOEO runs self tests then presents on-demand codes (O). After a single separator pulse. presents memory codes(M). KOER presents an engine code, 4 for 8 cylinder. Then runs tests and presents running codes(R).
