I recently installed the 90 mm, Jdm filter kit, Cobra TB, valve cover breather and JDM chip on my 2000 L. SOTP assessment-awesome!
I also just picked up today a new 6'X 10' x 6-5" high enclosed trailer for my stained glass business. On the trip home with said trailer, on the Interstate @ 70-75 mph, when I would give it more throttle, a very slight valve clatter was noticable. Getting up to speed, in what could be considered a normal way, there was no clatter. This concerns me. Fresh tank of Shell 93 for the trip down. On the leg back stopped at another Shell and topped off the tank. Still had a slight clatter, only under heavy acceleration from about 70. My quess is that this problem will only be aggravated more if the trailer is loaded. Or if it is loaded, will clatter at lower speeds trying to get up to speed.
Does it make sense to question the chip? Would the timing be altered or advanced enough by the chip to cause this? The truck never had clatter before. One thing I noticed after the install of the parts was this thing screams like a banshee now. Is it normal for it to sound like the blower's gonna come thru the hood @ 5K rpm??
Sorry for the length.

 

To answer your questions, YES, YES, and YES.
Did you tell Jim you were going to do towing?
Just a simple change in the weather will make your A/F ratio change. If your running close turning your A/C on can allow your L to ping.
Makwe sure Jim knows you will be towing with your L.

 

Try swiching to Amoco or Sunoco gas.There is a difference.

 

Amoco is suppossed to be the cleanest gas there is. I know someone who owns a '00 vette and the dealer told him to put nothing but Amoco gas in it. It also seems to be the cheapest right now

 

Sounds like pinging... get your chip reburned with a less aggressive program for towing... or say ba-bye to your motor.

 

I believe ALL the chip tuners recommend you don't tow with a chip or have a 2 position one that can be switched to the stock program. That sound you hear is detonation. Continue and you'll hear even more noise.

 

Why don't you pull the chip out and then try towing the trailer again? Then get on the phone quick with JDM. The sound you hear will make your motor go bye-bye

 

This is why I went with a 4 way chip. I can flip a switch and have stock program then switch again and have street or race or anittheft.

I would think it is the chip just as said above.

Paul

 

Hafta support DreaminAboutL -- there's no logical reason to believe that your valves were clattering.

Don't drive with that noise, or you'll have serious damage.

Bet: you used a buncha oil while your 'valves were clattering' -- right?

 

Ok guys he cannot just pull his chip..... he said he has the 90MM MAF and a 2000 'L which he must use the chip.


What you are hearing is detonation. If you are going to tow don't use overdrive. If you hear it pinging, not valve clatter, then back off it or expect to buy a new engine real soon.


paintdglas, you really need to contact Jim and let him know your problem so it can be corrected.

 

Thanks to one and all for your advice.
The amount of "pinging was faint, but there none the less. And it was onlya couple of times.
No I didn't burn oil. Yes I have the 90 mm on a 2000 so I can't just remove the chip. I think I'll take the advice of getting a flip chip maybe. I do not plan on ever getting nitrous so one side can be for towing, and the other can be the go fast side, eh?
Thanks again.

 

Faint or silent pinging is the worst kind...that's the kind that kills a motor. I would recommend swapping chips when towing or just pull the chip and swap the 90mm and intake hose.

For your tow chip, just leave a/f, timing, etc. alone and firm up the shifts if you would like, and adjust for the 90mm.

 

OK, gotta question for you guys... I have a '98 RegCab with a 4.6V8/Auto - I used to occasionally get some pinging with 87 octane gas under full throttle and steep inclines - started using the midgrade gas (89 octane) which has corrected my problem 99% of the time (i occasionally get a little pinging under full throttle, but very rarely.) I had never really worried about it until I noticed on here how so many people claim it can ruin your motor - is this the case, and if so what is causing this and what can be done to correct it? I probably first had the issue 30,000 miles ago around 25k

thanks for the help!

 

Do our engines have knock sensors ?

If so, it should (in a stock engine) back off the timing after a few engine cycles to the point of no more knock/pinging...

 

Correct me if I am wrong... While "pinging", "clatter" or pre detenation is not nice in any engine, what makes my situation hairy is the blower. Normal aspirated engines are more forgiving??

I bought my JDM chip from Mark @ LightningForce, along with a few other goodies. He has treated me professionally and very well indeed. He has listened to my problem, told me to send it back to Jim for reburn, and offered me more than he had to because of the problem.
I had tried Amoco but found that gas to ping while NOT towing. Sorry, I went back to Shell. I know it could've been once in a life time, but I've never had a problem with Shell.