secondaries not opening at full throttle - ZR-1 Net Registry Forums

SDZR-1 · 09-13-2007

So I just finished my starter and injector install and took it for a test drive...it definately ran better than w/ the old injectors, and hey, it even started...haha. So I solved the problems that I had, but now when I press the accellerator completely to the floor the secondaries will not open....if I let back a bit then they do. Also, 90% of the time it idles beautifully but once in awhile it starts to run a bit rough. I was thinking it had something to the throttle position sensor or maybe just the plug that goes into it since it just doesnt feel like it fits as snug as it should. SES light came on periodically for about five to ten seconds each time, so I will try to get it scanned tomorrow to see what codes I am getting. Any insight would be wonderful....thank you all for the help I have recieved so far, I doubt I would have even attempted the starter/injectors w/out all the helpful info and advice found here.

Jarvis

SDZR-1 · 09-13-2007

so i adjusted the tps and the secondaries now open at 100% throttle....but it is still just a bit rough at times...especially when I lug it down, such as cruising in 6th gear it really vibrates, but at higher rpm's it's fine. I guess I just need to hook the scan tool up to it and figure out what kind of voltage i have at the tps...who knows, maybe that is the whole problem and once it is set correctly everything will be good. anyway, just wanted to give a bit of an update.

jonszr1 · 09-13-2007

reemb er to set voltage to .54 on the tps . do a vaccume ck on the line from the vaccume pump , just be sure that nothing got dissconnedted putting the plenum back on. dont ask me how I know

you might also just ck the torq on the plenum bolts when she cools off. plug wires to see if one didnt click all the way on. cant think of anthing else that I have at one time or another messed up on

tomtom72 · 09-13-2007

off the top o my head....that CAC.com write up on the secondary vac system has the conditions for 2* engagement. I'd go back over that list of stuff. % of throttle, closed loop, oil temp, reference vacuum signal (MAP under the ECM). I know I'm forgetting something here, sorry!

How smoothly do the 2* actuators work? I know that some don't work smoothly at all due to mfg'ing defects upon assembly. I remember reading that over at the NetReg site in the maintenance section....I think Gordon had a bit to say about that issue. The arms were not squarely in the center of the diaphrams and when they pull the throttle levers they don't work smoothly. Also Grodon said that to make sure that when installed test them with a hand pump to verify smooth operation. I know I had to play around with mine....swap from side to side and flip them in order to get both opening smoothly and the same amount at any given vacuum setting.

Jez, does any of this make sense to you???

Tom

SDZR-1 · 09-13-2007

well some of it does...but it will all make sense in time. I will post codes just as soon as i can.

SDZR-1 · 09-13-2007

checked codes and came up w/ the tps sensor too low, which i corrected. It stil has a misfire going on which is slightly noticeable, but really shows it's face when the a/c is kicked on.

WB9MCW · 09-15-2007

If the secondaries are a PITA just yank them out.
No secondaries No Headache.

No performance issues w/o secondaries?

Pete · 09-16-2007

Quote:

Originally Posted by WB9MCW

If the secondaries are a PITA just yank them out.
No secondaries No Headache.

No performance issues w/o secondaries?

No driveability issues no performance issues.

Bryan,come over test drive my Z or a friends Z both 350ci
w/no secondaries and see for yourself.

jonszr1 · 09-16-2007

pete,do you need andifferent tune/ prom if you pull the secondaries. have you tested before and after at the strip . i would really like to do this I am so tired of chasing secondary gremlins. love to here your thoughts on this

Pete · 09-16-2007

Quote:

Originally Posted by jonszr1

pete,do you need andifferent tune/ prom if you pull the secondaries. have you tested before and after at the strip . i would really like to do this I am so tired of chasing secondary gremlins. love to here your thoughts on this

Yes,it needs some chip changes,nothing a good tuner can't do.

I have done a before and after and saw a gain of 4-6 RWHP on my 350ci and about 8-10 RWHP on the big inchers,nothing to brag about.
Lost no low end power from 2k rpm & higher.

The best part you eliminate some high priced secondary parts.

Pete

09-13-2007	#1
SDZR-1 Join Date: Aug 2007 Location: Bison, SD Posts: 106	secondaries not opening at full throttle So I just finished my starter and injector install and took it for a test drive...it definately ran better than w/ the old injectors, and hey, it even started...haha. So I solved the problems that I had, but now when I press the accellerator completely to the floor the secondaries will not open....if I let back a bit then they do. Also, 90% of the time it idles beautifully but once in awhile it starts to run a bit rough. I was thinking it had something to the throttle position sensor or maybe just the plug that goes into it since it just doesnt feel like it fits as snug as it should. SES light came on periodically for about five to ten seconds each time, so I will try to get it scanned tomorrow to see what codes I am getting. Any insight would be wonderful....thank you all for the help I have recieved so far, I doubt I would have even attempted the starter/injectors w/out all the helpful info and advice found here. Jarvis

09-13-2007	#2
SDZR-1 Join Date: Aug 2007 Location: Bison, SD Posts: 106	Re: secondaries not opening at full throttle so i adjusted the tps and the secondaries now open at 100% throttle....but it is still just a bit rough at times...especially when I lug it down, such as cruising in 6th gear it really vibrates, but at higher rpm's it's fine. I guess I just need to hook the scan tool up to it and figure out what kind of voltage i have at the tps...who knows, maybe that is the whole problem and once it is set correctly everything will be good. anyway, just wanted to give a bit of an update.

09-13-2007	#3
jonszr1 Join Date: Sep 2006 Location: lone pine and mammoth lakes Posts: 1,407	Re: secondaries not opening at full throttle reemb er to set voltage to .54 on the tps . do a vaccume ck on the line from the vaccume pump , just be sure that nothing got dissconnedted putting the plenum back on. dont ask me how I know you might also just ck the torq on the plenum bolts when she cools off. plug wires to see if one didnt click all the way on. cant think of anthing else that I have at one time or another messed up on

09-13-2007	#4
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,645	Re: secondaries not opening at full throttle off the top o my head....that CAC.com write up on the secondary vac system has the conditions for 2* engagement. I'd go back over that list of stuff. % of throttle, closed loop, oil temp, reference vacuum signal (MAP under the ECM). I know I'm forgetting something here, sorry! How smoothly do the 2* actuators work? I know that some don't work smoothly at all due to mfg'ing defects upon assembly. I remember reading that over at the NetReg site in the maintenance section....I think Gordon had a bit to say about that issue. The arms were not squarely in the center of the diaphrams and when they pull the throttle levers they don't work smoothly. Also Grodon said that to make sure that when installed test them with a hand pump to verify smooth operation. I know I had to play around with mine....swap from side to side and flip them in order to get both opening smoothly and the same amount at any given vacuum setting. Jez, does any of this make sense to you??? Tom __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member

09-13-2007	#5
SDZR-1 Join Date: Aug 2007 Location: Bison, SD Posts: 106	Re: secondaries not opening at full throttle well some of it does...but it will all make sense in time. I will post codes just as soon as i can.

09-15-2007	#7
WB9MCW Join Date: Dec 2003 Location: McHenry, Il. Posts: 6,607	Re: secondaries not opening at full throttle If the secondaries are a PITA just yank them out. No secondaries No Headache. No performance issues w/o secondaries? __________________ http://i119.photobucket.com/albums/o...9mcw/SIG-2.jpg http://i119.photobucket.com/albums/o128/wb9mcw/vcm.gif "The Budget should be balanced, the Treasury should be refilled, public debt should be reduced, the arrogance of officialdom should be tempered and controlled, and the assistance to foreign lands should be curtailed, lest Rome will become bankrupt. People must again learn to work instead of living on public assistance." - Cicero, 55 BC " We the people are the rightful masters of both Congress and the courts, not to overthrow the Constitution but to overthrow the men who pervert the Constitution." - Abraham Lincoln

09-16-2007	#9
jonszr1 Join Date: Sep 2006 Location: lone pine and mammoth lakes Posts: 1,407	Re: secondaries not opening at full throttle pete,do you need andifferent tune/ prom if you pull the secondaries. have you tested before and after at the strip . i would really like to do this I am so tired of chasing secondary gremlins. love to here your thoughts on this

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