| Author |
Message |
Hans E. Hansen (4re_gt4)
Junior Member
Username: 4re_gt4
Post Number: 111
Registered: 4-2002
| | Posted on Friday, August 30, 2002 - 6:13 pm: | |
Low end tractability improved considerably with FI. The carbs are a bit big to meter fuel correctly at big throttle openings and low rpm. |
Lawrence Coppari (Lawrence)
Junior Member
Username: Lawrence
Post Number: 226
Registered: 4-2002
| | Posted on Friday, August 30, 2002 - 5:15 pm: | |
My 328 with 10.5 ratio will accelerate from 1500 rpms in 5th gear. If yours is pinging at 4K, either something is wrong with fuel or engine. Did it once run 91 octane ok? If it did, something has changed in engine. Pinging at 4K is very unusual. It is a wonder you can hear it.
It must be a significant ping. |
Hans E. Hansen (4re_gt4)
Junior Member
Username: 4re_gt4
Post Number: 108
Registered: 4-2002
| | Posted on Friday, August 30, 2002 - 3:46 pm: | |
I always have to grin a bit when talking about Ferraris and rpm. Basically they told you 4k rpm is too slow! (I know, I know, I over simplified the situation.) One time I tried to climb a steep hill in my old carb car at about 3K. Ping, ping, cough, stutter, and died before I could do a downshift. Seems the damned things don't run right unless revved to the nuts. |
Mitch Alsup (Mitch_alsup)
Junior Member
Username: Mitch_alsup
Post Number: 131
Registered: 4-2002
| | Posted on Friday, August 30, 2002 - 1:58 pm: | |
The octane booster stuff is just to experiment to verify if the ping is octane related or something else. If it works AND you don't have any other reasoable way to get octane, then what you want to do is to buy 5 gallon containers of tolulene and xylene and mix 50%/50% and add up to 1 gal of mix to 10 gal of gas. This mixture ends up costing only about $.50/pint compared to $4.00/pint for the store brands. Use it only if you have to. |
Frank Parker (Parkerfe)
Intermediate Member
Username: Parkerfe
Post Number: 1284
Registered: 9-2001
| | Posted on Friday, August 30, 2002 - 12:21 pm: | |
I bet it is one of those pestky Dinos banging around in the engine causing that ping. |
Dave Mills (360dave)
Junior Member
Username: 360dave
Post Number: 71
Registered: 1-2002
| | Posted on Friday, August 30, 2002 - 11:39 am: | |
So I called the dealer (F of Seattle) yesterday about this problem, here's the report back.
Basically, I should downshift. Driving along the freeway in 6th at 4K is fine, but expecting to accelerate past someone, even just a gradual speed increase, should come with a downshift. If the ping existed after the downshift (it doesn't), then he'd suggest bringing it in, but he thought it was normal for the scenario I described (heat, rpm, etc). He asked if any of the other temp gauges were reading high (they're not), or whether there were any check engine lights (no).
By the way, he said there is not separate programming by states, this is the same program everyone else gets, other than the periodic updates over time that come from the factory.
I may try the octane thing, Mitch, thanks. Octane boost "points" are a tenth of a point compared to the gas pump, so you'd need a boatload of boost in there to accomplish the test you have in mind, but I can put some 100 octane unleaded in at some point and see if I can reproduce the problem. It would be interesting to know.
Thanks for the help.
Dave |
Mitch Alsup (Mitch_alsup)
Junior Member
Username: Mitch_alsup
Post Number: 129
Registered: 4-2002
| | Posted on Friday, August 30, 2002 - 10:12 am: | |
You can easily tell if its octane related--go buy a can of octane booster (just pick one), and wait for a day that pinging is happening, then put it in the gas tank. If the pinging goes away, its octane.
Assuming its octane, you can try different brands in your area to see if one is just a little closer to what the car wants (pings less). Or you could move to a state that ............ |
Dave Mills (360dave)
Junior Member
Username: 360dave
Post Number: 70
Registered: 1-2002
| | Posted on Thursday, August 29, 2002 - 9:04 am: | |
I only have 91 octane available, and haven't used any fuel system cleaners other than what Chevron puts in the gas itself (the car's got 2000 miles on it).
Good point about where the car came from, I wonder if that's an issue. I bought it from Seattle and had it delivered down here. They certainly knew it was headed this way, though. I didn't realize the programming would be different by state.
Dave |
David White (Dwhite)
Junior Member
Username: Dwhite
Post Number: 59
Registered: 7-2002
| | Posted on Thursday, August 29, 2002 - 8:57 am: | |
Did you buy the car from a California dealer. I would think they would have it set up for 91 octane or whatever the Calif. limit is. Maybe your timing is just slightly off. I would bring it back and have it resolved quickly. |
bruce wellington (Bws88tr)
Member
Username: Bws88tr
Post Number: 782
Registered: 4-2002
| | Posted on Thursday, August 29, 2002 - 7:11 am: | |
dave
here in nj we can get 94 octane from sunoco, is that available by you??
also have you used techron-chevron??
my .02 cents |
Dave Mills (360dave)
Junior Member
Username: 360dave
Post Number: 69
Registered: 1-2002
| | Posted on Wednesday, August 28, 2002 - 11:27 pm: | |
Yes, there is, but the dealer is a couple hundred miles away. I was just trying to see if anyone else has experienced the issue. My suspicion is that my engine and programming are identical to every other 360. The only difference might be the gas I've got, but it's a bit of a surprise to me that no one else has responded with this experience. I'll definitely mention it to the dealer though.
Thanks,
Dave |
Henryk (Henryk)
Junior Member
Username: Henryk
Post Number: 208
Registered: 8-2001
| | Posted on Wednesday, August 28, 2002 - 11:03 pm: | |
Dave: Why not take it back to the dealer? Isn't there a warranty on it? |
Dave Mills (360dave)
Junior Member
Username: 360dave
Post Number: 68
Registered: 1-2002
| | Posted on Wednesday, August 28, 2002 - 11:00 pm: | |
Yes, I'm sure it does have knock sensors. I guess I'm surprised to be getting knock at all.
Dave |
Lawrence Coppari (Lawrence)
Junior Member
Username: Lawrence
Post Number: 219
Registered: 4-2002
| | Posted on Wednesday, August 28, 2002 - 5:23 pm: | |
Surely it has knock sensors. Even my '86 Porshe has one. It'll have the CPU retard the timing to stop it from happening. You might want to look into it. But I don't have a 360 so I really should not comment. But DME's are rather sophisticated these days. |
Dave Mills (360dave)
Junior Member
Username: 360dave
Post Number: 65
Registered: 1-2002
| | Posted on Friday, August 23, 2002 - 11:11 pm: | |
In the hot valley weather, I've noticed twice that my '01 360 pings a bit if I accelerate in high gear at freeway speeds. It's fine if I downshift, or if the weather is cool. I'm using Calif 91 octane, and this has happened through a couple tanks of Chevron gas.
The only thing I can think of is the PCM is programmed pretty agressively, and would rather have 92-3 octane gas.
Is this common, or is my car unique?
Dave |