| Author |
Message |
Dirk Rabenschwanz (Dirk)
New member
Username: Dirk
Post Number: 45
Registered: 4-2001
| | Posted on Saturday, November 09, 2002 - 4:58 am: | |
Bill,
i think Your stock timing setup is correct,
but the timing on US cars is for the emissions not for performance.
The US QV has 3 degree ATDC and the euro QV has
12 degree BTDC at idle. These late timing on US cars has advantages for the emissions, but it works only fine ( for my opinion ) if all ignition and FI parts are perfect, and this isnt so by a 17 year old car.
You can also observe these effect after
installing new plugs and a few hundred driven miles. The car starts und running warm normally.
There should be no problem, because at warm up procedure, the car gets an enriched fuel mixture.
When You drive the car a few miles and the engine compartment is completely warmed up, You can observe, when You accelerate from idle up, that the engine runs rough at idle area.
The reason is simple, all parts are warm, the engine gets warmer air and the fuel mixture has a little less fireup capability. And in combination with the bad timing at idle You have these effect.
I think You will find these especially on the 84 and 85 US QVs, because these cars has lambda control.
By the 82, 83 QVs You can enrich the fuel mixture manually, because these cars has no feedback control.
The 328 has another timing, fires at TDC.
Dirk |
Bill V. (Doc)
Junior Member
Username: Doc
Post Number: 187
Registered: 9-2001
| | Posted on Friday, November 08, 2002 - 7:43 pm: | |
Dirk--do you mean to say that the set, stock timing is bad and causes this or that the car 's timing could be off ( from the stock setting)? |
Dirk Rabenschwanz (Dirk)
New member
Username: Dirk
Post Number: 44
Registered: 4-2001
| | Posted on Friday, November 08, 2002 - 12:59 pm: | |
My car does the same. If You use new plugs, it should be better but, after 1000mls it will come back. I think the reason is the bad igintion timing at idle speed, in combination with a little problem in the FI system, maybe old injectors. ( Only US Cars )
Dirk |
magoo (Magoo)
Advanced Member
Username: Magoo
Post Number: 3447
Registered: 2-2001
| | Posted on Thursday, November 07, 2002 - 7:52 pm: | |
Tim, I think you are correct. I used champions in every range until I tried the NGK5s and that cured my plug carbon problem and rich gas smell. |
Timothy Fulmer (Tf308)
New member
Username: Tf308
Post Number: 21
Registered: 5-2002
| | Posted on Thursday, November 07, 2002 - 4:45 pm: | |
I was running the stock champion 6 plugs in my QV. I am in the middle of taking the head off and man..you should see the carbon buildup on the valves! Use a hotter plug! |
Greg Rodgers (Joechristmas)
Member
Username: Joechristmas
Post Number: 527
Registered: 3-2001
| | Posted on Thursday, November 07, 2002 - 10:42 am: | |
I have used NGK and Champion and to be honest I didn't think the NGK was worth the extra price. JMHO. Next plug up is a Champion 7 but you should go higher. |
Frank Parker (Parkerfe)
Intermediate Member
Username: Parkerfe
Post Number: 1484
Registered: 9-2001
| | Posted on Thursday, November 07, 2002 - 8:01 am: | |
I would not use any other brand than NGK on any car I own. They are the best by a large margin. I use them on my Harley two. And the recent issue of FORZA did agree that NGKs are the best for Ferraris as well. |
Neil Green (Neilg)
Junior Member
Username: Neilg
Post Number: 53
Registered: 2-2001
| | Posted on Thursday, November 07, 2002 - 6:16 am: | |
The latest issue of FORZA has an excellent article on spark plugs for Ferraris. For older cars, the author recommends a hotter NGK plug. |
Greg Rodgers (Joechristmas)
Member
Username: Joechristmas
Post Number: 525
Registered: 3-2001
| | Posted on Thursday, November 07, 2002 - 6:00 am: | |
I agree with Bob. I have been using Champion N9YCs for the past 2 years and they have been working great. |
magoo (Magoo)
Advanced Member
Username: Magoo
Post Number: 3433
Registered: 2-2001
| | Posted on Wednesday, November 06, 2002 - 10:58 pm: | |
Billy, I had the same problem with my 79 308 GTS until I used the NGK BP5ES. I would widen the gap probably to .030. |
Bob Campen (Bob308gts)
Member
Username: Bob308gts
Post Number: 371
Registered: 9-2001
| | Posted on Wednesday, November 06, 2002 - 9:47 pm: | |
An N6YC Champion is a very cold plug, my 79 308 calls for N7Y and I have been running N9YC with good results. I have just gotten a set of NGK plugs BP6ES same heat range as the Champ N9YC, NGK the number goes down with increase in heat range Champion goes up with the increase. |
david handa (Davehanda)
Member
Username: Davehanda
Post Number: 301
Registered: 5-2001
| | Posted on Wednesday, November 06, 2002 - 9:07 pm: | |
Try the stock heat range, but use NGK plugs. To find the proper one, go to their website. Do a "google" search to find it.... |
Bill V. (Doc)
Junior Member
Username: Doc
Post Number: 185
Registered: 9-2001
| | Posted on Wednesday, November 06, 2002 - 8:36 pm: | |
Now that the cold, wet Northeastern weather is here, I'm not taking my car out as much and , as a result, it's idling more as I warm it up regularly. I've noticed that the idle is getting rough --sounding like the plugs loading up. It clears with a good rev, but begins to stumble again fairly quickly.
Do you think that it would be a good idea to install a hotter heat range plug , at least through the Winter months, when the car will be idling a lot more than usual in order to clear this up. I presently have Champions in the car--# N6YC . Is this considered to be a hot or cold plug and what would be the next hotter plug # ? |