| Author | Message | ||
| Bill V. (Doc)
Junior Member Username: Doc Post Number: 142 Registered: 9-2001 |
Darrell-I was advised to be very careful in adjusting the mixture on an injected, computerized model and should be done with professional emissions montoring equipment. However, the way to do it is to turn the Allen head adjustment screw clockwise to richen and counterclockwies to lean. The wrench size is 3mm and it takes very little turning to change the mixture--like 1/10th turn! Re: the plugs, do they look like they're burning rich? I'd use the plugs as a basic guide. If they don't look bad, I wouldn't fool around with the adjustment much. | ||
| Darrell Pardy (Dpardyferrari)
New member Username: Dpardyferrari Post Number: 7 Registered: 8-2002 |
Thanks for the responses - the slowdown light problem is still sporadic, but more times than not it occurs after the first startup of the day. The plugs in the car are brand new so I am wondering if it might be that the car is running too rich and this is messing with the CC at times. Can anyone give me advice on leaning out the car a wee bit. I know where the adjustment screw is, but how much of a turn and in what direction? Thanks in advance. | ||
| Bruno (Originalsinner)
Member Username: Originalsinner Post Number: 548 Registered: 5-2002 |
Change the spark plugs.That fixed mine. | ||
| Steve Magnusson (91tr)
Intermediate Member Username: 91tr Post Number: 1066 Registered: 1-2001 |
The bulbs will be the lucky fix (but worth checking those and the ECU power and ground before putting out any $ for the more expensive bits). My one bad experience in this area follows Ric's list -- I replaced both specialized warning light ECUs on my TR (although my ex-308 system always worked). | ||
| Stephen E. Schroeder (Seschroeder)
New member Username: Seschroeder Post Number: 27 Registered: 4-2002 |
I'll have to bow to the experts in this case. I'm new to this and they know far more than I. I rather suspect tonight I'll be checking the light blubs on my car. | ||
| Paul Newman (Newman)
Member Username: Newman Post Number: 491 Registered: 12-2001 |
My 79 has no converters at the moment but the probes are tied off to the frame rail. The lights both light up on start up and slowly dim to off in a couple of seconds. I figured it was a bulb test like your instrument panel has. | ||
| Steve Magnusson (91tr)
Intermediate Member Username: 91tr Post Number: 1065 Registered: 1-2001 |
Steve S. -- We'll have to agree to disagree as the "cold self-test" worked as described in the OMs on both my ex-308 and TR. Anyone else know if their self-test is working or not? | ||
| Stephen E. Schroeder (Seschroeder)
New member Username: Seschroeder Post Number: 26 Registered: 4-2002 |
I was told by Norwood's, in Dallas, that the O/H Warning will only come on if there is an actual overheat - that they will NOT come on first thing in the morning. This seems to be contray to the Owners Manual. I don't know but I'd be willing to bet that all the test does is check the light bulbs. I've never seen them on, cold or otherwise, on my 308. | ||
| Ben Millermon (Brainsboy)
Junior Member Username: Brainsboy Post Number: 53 Registered: 5-2001 |
Im not sure if this is correct but dont 308's have a problem with catching on fire? Are the converters the cause of this problem, and thats why they have these lights. | ||
| Steve Magnusson (91tr)
Intermediate Member Username: 91tr Post Number: 1064 Registered: 1-2001 |
I'd add that the catalyst over-temp warning light(s) have a self-test which will be described in the OM (usually engine cold, turn ign. key on, warning lights come on for a few seconds and then go out). If a warning light is misbehaving during this self-test then you really can't trust it at all IMO (although one can argue that even passing the self-test doesn't mean that they won't or can't misbehave in later operation  ). | ||
| Edward Gault (Irfgt)
Intermediate Member Username: Irfgt Post Number: 1996 Registered: 2-2001 |
There is a tepmerature sensor inside each converter that sends a signal to an individual amplifier that will illuminate the light for the corresponding cylinder bank that the converter is connected to. Should a converter temperature go above a preset amount the light will illuminate warning you of a potential problem. | ||
| Ben Millermon (Brainsboy)
New member Username: Brainsboy Post Number: 49 Registered: 5-2001 |
I know this is a stupid question, but what are these lights for? What do they do? I have seen them in my ferrari and been meaning to ask someone. I thought is was something to do with the timming since there are two distributors. | ||
| Ric Rainbolt (Ricrain)
Junior Member Username: Ricrain Post Number: 235 Registered: 2-2002 |
IMHO, the failure modes for this tend to be (in order): amplifier moudle, thermocouple, ground, catalyst. If you have a dual catalytic car (1-4 bank and 5-8 bank), you can do this: Swap the amp moudles (in the passenger side kick panel) and see if the problem "follows" the swap. If not, check the thermocouples by swapping the thermocouple connections to the amplifiers (don't forget to put them back or the 1-4/5-8 will forever be backwards!). | ||
| Edward Gault (Irfgt)
Intermediate Member Username: Irfgt Post Number: 1964 Registered: 2-2001 |
I would bet that one of the sensors has developed a short. It could not be a converter because it cannot overheat immediately on startup and since the situation clears up after running I would bet on a shorted sensor or the sensor amplifier. | ||
| Darrell Pardy (Dpardyferrari)
New member Username: Dpardyferrari Post Number: 3 Registered: 8-2002 |
My 1984 308QV has recently developed a new problem. After starting the car for the first time in the day(and a 5 minute warm up until a decent idle) and driving off I get the slowdown light coming on. It may blink on and off initially but then stays on solid. I stop the car and the light goes off, then after a minute or two drive off and the light stays out. No problems (yet) for the rest of the day? Is this a faulty sensor, faulty light, or is my catalytic converter over heating. All the guages look ok. Any thoughts on where to begin looking? |