Changing the spark plugs..... - Page 4 - ZR-1 Net Registry Forums

DRM500RUBYZR-1 · 03-13-2017

Quote:

Originally Posted by Roadster

Ok, could not contain myself any longer.....so the roads are halfway decent and I went for a ride with my new sparkplugs....I like them a lot.
Even though the cold temps @ 33* helps with power, I have to say these new plugs are extremely responsive. Pulls effortlessly through all the gears, feeling like more added power even besides the secondaries now being fully operational.

Now for a few slight (have to figure out) items....
1- Got into it in 1st gear getting the r's close to 5k, and it felt like the accelerator pedal kicked back towards my foot. Shifted into 2nd & 3rd, brought the r's up again, was fine. Tried it again after a mile or so, did not do it that time. All future heavy throttle in 1st gear did not duplicate the kickback. Thought that was kind of unusual....

2- I noticed that when the plenum pull was done, and the vacuum issues were addressed, when first turning the key to the on position to hear the vacuum pump, it only came on for about 2-3 seconds. Today when first started, it stayed on for 3-5 seconds. All repeat "hot" starts just turning the key to the on position did not activate the pump at all.

3- Reason #2 has me concerned is that the idle is still not quite right. And at one time today, it did go as high as 1200 r's when I came to a stop. Sometimes it will idle at 650-700 r's when stopped, other times it will be at 900-1000 r's when stopped.
If I am stopped with trans in 1st gear, and idle is higher and I let the clutch out slightly with my foot on the brake, as soon as the clutch starts to engage, the idle will drop to normal and stay there even as I press down on the clutch pedal to disengage.
I know that there may be a couple of things to look for, as has been mentioned before, such as: the throttle blades completely closing, or a slight vacuum leak due to a vacuum hose coming loose under the plenum. Although the digital camera showed everything looking good from before....

Engine runs great, the best since I have owned the Z, once the idle issue gets resolved, it will be complete.....at least for me!!!

Tom,
That sure sounds exactly like the description of how the ASR feels when it decides to meddle in your fun in order to rescue you from wheel-spin.

My car used to routinely invoke the ASR as I passed through 5500 rpm, as the tires would begin to break loose.

To confirm you could replicate it with ASR off, but I do not really recommend that.

Perhaps your new secondaries, plugs, etc, are now providing you with a lot more power than before.

Try lighting them up during launch, and see if the pushback that you will feel on the accelerator is the same.

If so, it's a good thing!

You are making too much power for the tires!

Marty

Roadster · 03-13-2017

Quote:

Originally Posted by DRM500RUBYZR-1

Tom,
That sure sounds exactly like the description of how the ASR feels when it decides to meddle in your fun in order to rescue you from wheel-spin.

My car used to routinely invoke the ASR as I passed through 5500 rpm, as the tires would begin to break loose.

To confirm you could replicate it with ASR off, but I do not really recommend that.

Perhaps your new secondaries, plugs, etc, are now providing you with a lot more power than before.

Try lighting them up during launch, and see if the pushback that you will feel on the accelerator is the same.

If so, it's a good thing!

You are making too much power for the tires!

Marty

You know Marty, Yun and you are right on about the ASR. Before when approaching the 7000+rpm shifts during WOT, I never felt the ASR engage.
Now since the secondaries are operational, I noticed the Z gets really loose at that 5500 rpm range , and even more so now with the new spark plugs. And of course already having Marc's chip in there with that extra 10 HP in addition to the parameters it enhances, my LT5 just runs sooooo good!!!
Yes, I agree I am making too much power for the tires....

lfalzarano · 03-13-2017

Have you upgraded your chip?

http://www.zr1specialist.com/HAT%20W...on%20BMCBG.htm It will help with the idle and throttle issues you mentioned.

Roadster · 03-13-2017

Yes I have, it was the first item I did when I purchased the Z 3 years ago....
It was normal before the plenum pull....that's why I think it maybe a hose that has come loose as the pump runs a little longer as stated above.
Throttle is perfect, closes @0% and opens to 100% @ WOT, as per the Tech 1.

Sent from my SM-G935P using ZR-1 Net Registry mobile app

secondchance · 03-13-2017

1- Got into it in 1st gear getting the r's close to 5k, and it felt like the accelerator pedal kicked back towards my foot. Shifted into 2nd & 3rd, brought the r's up again, was fine. Tried it again after a mile or so, did not do it that time. All future heavy throttle in 1st gear did not duplicate the kickback. Thought that was kind of unusual....
Are you sure this is not ASR activating?

2- I noticed that when the plenum pull was done, and the vacuum issues were addressed, when first turning the key to the on position to hear the vacuum pump, it only came on for about 2-3 seconds. Today when first started, it stayed on for 3-5 seconds. All repeat "hot" starts just turning the key to the on position did not activate the pump at all.
This type of variation is not unusual. I wouldn't worry about this.

3- Reason #2 has me concerned is that the idle is still not quite right. And at one time today, it did go as high as 1200 r's when I came to a stop. Sometimes it will idle at 650-700 r's when stopped, other times it will be at 900-1000 r's when stopped.
We'll investigate when we have our WAZOO meet.

lfalzarano · 03-13-2017

I would check all hoses outside the plenum first, before pulling it. There is this one hose that comes out and over towards the radiator reservoir on the passenger side in the nose. It has a connection that passes over the top of the AC hoses. It comes loose if you were working in that area.

Roadster · 03-13-2017

"Are you sure this is not ASR activating?"

It very well could have been the ASR activating....didnt even give it a thought, as there was some salt dust still on the road...

"This type of variation is not unusual. I wouldn't worry about this."

Yea, that's me always thinking of something...

"We'll investigate when we have our WAZOO meet."

Sounds good to me....

Sent from my SM-G935P using ZR-1 Net Registry mobile app

Hib Halverson · 09-09-2017

Anti-seize or oil works well on plug threads but if you use anti-seize compound you MUST use non-metallic anti seize.

Much of the anti-seize on the market has copper, moly or nickel in it so read lables before you buy.

My favorite for spark plugs is DuPont Krytox a flourinated grease which has anti-seize properties and is very durabile at high temperature.

Roadster · 09-09-2017

Quote:

Originally Posted by Hib Halverson

Anti-seize or oil works well on plug threads but if you use anti-seize compound you MUST use non-metallic anti seize.

Much of the anti-seize on the market has copper, moly or nickel in it so read lables before you buy.

My favorite for spark plugs is DuPont Krytox a flourinated grease which has anti-seize properties and is very durabile at high temperature.

Thanks for the tip.....I will have to check my supply.....

03-13-2017	#3
lfalzarano Join Date: Feb 2011 Location: Clayton, North Carolina Posts: 1,133	Re: Changing the spark plugs..... Have you upgraded your chip? http://www.zr1specialist.com/HAT%20W...on%20BMCBG.htm It will help with the idle and throttle issues you mentioned.

03-13-2017	#4
Roadster Join Date: Mar 2014 Location: Warrington PA Posts: 1,914	Re: Changing the spark plugs..... Yes I have, it was the first item I did when I purchased the Z 3 years ago.... It was normal before the plenum pull....that's why I think it maybe a hose that has come loose as the pump runs a little longer as stated above. Throttle is perfect, closes @0% and opens to 100% @ WOT, as per the Tech 1. Sent from my SM-G935P using ZR-1 Net Registry mobile app __________________ Tom 1994 ZR-1 #009 "captured test fleet car" 1974 LS4 454 Vert 1974 L-82 355 Vert. 1982 L83 CFI...now a retired "dd"....Sold WAZOO Member

03-13-2017	#5
secondchance Join Date: Aug 2006 Location: McLean, VA Posts: 3,731	Re: Changing the spark plugs..... 1- Got into it in 1st gear getting the r's close to 5k, and it felt like the accelerator pedal kicked back towards my foot. Shifted into 2nd & 3rd, brought the r's up again, was fine. Tried it again after a mile or so, did not do it that time. All future heavy throttle in 1st gear did not duplicate the kickback. Thought that was kind of unusual.... Are you sure this is not ASR activating? 2- I noticed that when the plenum pull was done, and the vacuum issues were addressed, when first turning the key to the on position to hear the vacuum pump, it only came on for about 2-3 seconds. Today when first started, it stayed on for 3-5 seconds. All repeat "hot" starts just turning the key to the on position did not activate the pump at all. This type of variation is not unusual. I wouldn't worry about this. 3- Reason #2 has me concerned is that the idle is still not quite right. And at one time today, it did go as high as 1200 r's when I came to a stop. Sometimes it will idle at 650-700 r's when stopped, other times it will be at 900-1000 r's when stopped. We'll investigate when we have our WAZOO meet.

03-13-2017	#6
lfalzarano Join Date: Feb 2011 Location: Clayton, North Carolina Posts: 1,133	Re: Changing the spark plugs..... I would check all hoses outside the plenum first, before pulling it. There is this one hose that comes out and over towards the radiator reservoir on the passenger side in the nose. It has a connection that passes over the top of the AC hoses. It comes loose if you were working in that area.

03-13-2017	#7
Roadster Join Date: Mar 2014 Location: Warrington PA Posts: 1,914	Re: Changing the spark plugs..... "Are you sure this is not ASR activating?" It very well could have been the ASR activating....didnt even give it a thought, as there was some salt dust still on the road... "This type of variation is not unusual. I wouldn't worry about this." Yea, that's me always thinking of something... "We'll investigate when we have our WAZOO meet." Sounds good to me.... Sent from my SM-G935P using ZR-1 Net Registry mobile app __________________ Tom 1994 ZR-1 #009 "captured test fleet car" 1974 LS4 454 Vert 1974 L-82 355 Vert. 1982 L83 CFI...now a retired "dd"....Sold WAZOO Member Last edited by Roadster; 03-13-2017 at 09:07 PM.

09-09-2017	#8
Hib Halverson Join Date: Jun 2005 Location: CenCoast California Posts: 898	Re: Changing the spark plugs..... Anti-seize or oil works well on plug threads but if you use anti-seize compound you MUST use non-metallic anti seize. Much of the anti-seize on the market has copper, moly or nickel in it so read lables before you buy. My favorite for spark plugs is DuPont Krytox a flourinated grease which has anti-seize properties and is very durabile at high temperature. __________________ Hib Halverson Technical Writer former owner 95 VIN 0140 current owner 19 VIN 1878 Last edited by Hib Halverson; 09-09-2017 at 01:41 PM.