| Author | Message | ||
| Kelly (Tifosi1)
Member Username: Tifosi1 Post Number: 691 Registered: 2-2002 |
Go get a new compressor at NAPA fro $130.00 part number 258108. I do not notice a reduction in RPMs at idle, but I do notice a different note or sound. Kelly | ||
| Erik R. K. Jonsson (Gamester)
Member Username: Gamester Post Number: 353 Registered: 11-2000 |
Could the additional elecrical draw when the AC is on be pointing to a fuse box issue? -caused by lack of power to the ignition? | ||
| Hans E. Hansen (4re_gt4)
Intermediate Member Username: 4re_gt4 Post Number: 1550 Registered: 4-2002 |
Greg: I'm surprised too. This car has the 'strongest' idle (if that is a concept) of any car I've driven. With a 1000rpm idle (confirmed with a shop tach), I can fairly rapidly release the clutch and the car just takes off - w/o touching the gas. It'll even do this in 2nd gear. Damn near impossible to stall it. Are all 308s this way? By turning the a/c thermostat, I can hear the a/c clutch cycle, but can detect no drag on the motor. | ||
| Greg Rodgers (Joechristmas)
Member Username: Joechristmas Post Number: 774 Registered: 3-2001 |
I am surprised. Most cars rpms do drop that is why they made idle up circuits. I have a Sanden in my 308 and there is still a drop in rpms when the clutch is engaged. (on the compressor not the gearbox) | ||
| Hans E. Hansen (4re_gt4)
Intermediate Member Username: 4re_gt4 Post Number: 1547 Registered: 4-2002 |
JRV: I've seen the idle low on quite a few of these cars simply because people tinker with them. An owner thinks he is doing the car a favor by adjusting the timing or mixture - idle is affected and often not properly set. Simple concept, really. Steve: I can't detect any rpm drop or load with the old York compressor. Blows cold, just had a minor overhaul (seals) done. But, yeah, I've heard that the Sanden works better so I'm probably heading that way also. | ||
| Steve (Steve)
Member Username: Steve Post Number: 434 Registered: 2-2001 |
Hans I just did a major tune on the 77 and after last year I needed to adjust the idle up to compensate for the compressor. I set the idle at 1100 rpm and with the compressor on it idles at 1000. I can understand why folks are going with the compact rotary compressors. I'll do it in a few years to. The piston type (York) takes a lot of HP to run. | ||
| JRV (Jrvall)
Intermediate Member Username: Jrvall Post Number: 1902 Registered: 11-2002 |
>>but perhaps your idle is just too low? << Uhhh...idle doesn't just get to low by magic...;-)..it slowly evolves from "tuning issues" that require "adjustments" which is "re-tuning"..something like a Piano...it niether goes downhill or can go back uphill all by itself, requires Tuning. And without having a look around at different things (systems/specs) it's not possible to know the extent of 'tuning' needed. | ||
| Hans E. Hansen (4re_gt4)
Intermediate Member Username: 4re_gt4 Post Number: 1544 Registered: 4-2002 |
Hi Tom. You could have tune-up issues as JRV suggests, but perhaps your idle is just too low? I've got mine idling at 1000rpm, and I don't notice ANY rpm change when turning on the A/C. Selling Mario? Shame, shame. | ||
| JRV (Jrvall)
Intermediate Member Username: Jrvall Post Number: 1884 Registered: 11-2002 |
>>"all in one" ignition. << Yea that's pretty much the perception of Black Boxes in general and MSD's especially. While an MSD will MASK some minor problems, they are certianly not a "Tune Up in a Can". Isuggest a real thourough going thru of the igntion system condition & the carbs. Nothing beats an old fashioned "tune up" where everthing is checked, adjusted and set right. | ||
| Tom Reynolds (Kjtar)
New member Username: Kjtar Post Number: 3 Registered: 1-2002 |
I hope someone can help me diagnose what I need to do to solve this problem, and maybe even more importantly, what directions not to go. I have a 1978 308gt4 with a brand new MSD "all in one" ignition. When my car is running without the a/c on, it is smooth (although I think maybe the idle might be a bit low) but when I turn the a/c on (southern Arizona) the car seems to stumble. It's like one of the plug wires becomes disconnected (but they are all tight) when I run with the a/c on. When it's off, this doesn't seem to happen. My local mechanic here has said something about "secondary ignition" and "distributor cap" but I think he might be using my 'Mario' to help finance his new house and property.  I want to get the car running properly so I can get the driver's seat reupholstered and then, regrettably, sell the car. Can you offer any insight as to what I should look for with this problem, and what would be involved in getting 'Mario' to be happy even with the a/c operating? One friend of mine said something about possibly having the a/c compressor rebuilt? Thanks very much, Tom Reynolds Hereford, AZ (just south of Sierra Vista, about 70 miles S.E. of Tucson) P.S. Private replies to Tom's email will be fine. |