ZR1 default 61 port throttle system failure
07-13-2010, 06:08 PM
#1
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ZR1 default 61 port throttle system failure
Hi from France. 
Sorry for my bad language.
A friend have a problem with his ZR1 91.
At 5000rpm approximitivly , power problem.
I scanned the car with my autoXray , and the code 61 is set.
So i have no documentation about C4 ( my corvette is a C5 full USA
) I m a member of Corvette Club de France. 
After research on net , i found this item
http://www.ecklers.com/corvette-adju...1992-1996.html
but i'm not sure it's interesting
Here toptechx6 give me a link
, but i don't understand very well.
http://forums.corvetteforum.com/c4-z...my-94-zr1.html
The problem is my friend is not in my region and i have to explain him the solution , because he don't speak english
So , if anyone could explain me with easy chosen words
easy to translate , what the problem is , how to repair , and details with schematics if possible or a complete link about this problem with located items to repare ?
Sorry again for my bad language.
Thank's a lot.
Bruno
Sorry for my bad language.
A friend have a problem with his ZR1 91.
At 5000rpm approximitivly , power problem.
I scanned the car with my autoXray , and the code 61 is set.
So i have no documentation about C4 ( my corvette is a C5 full USA
) I m a member of Corvette Club de France. After research on net , i found this item
http://www.ecklers.com/corvette-adju...1992-1996.html
but i'm not sure it's interesting
Here toptechx6 give me a link
, but i don't understand very well. http://forums.corvetteforum.com/c4-z...my-94-zr1.html
The problem is my friend is not in my region and i have to explain him the solution , because he don't speak english
So , if anyone could explain me with easy chosen words
easy to translate , what the problem is , how to repair , and details with schematics if possible or a complete link about this problem with located items to repare ? Sorry again for my bad language.
Thank's a lot.
Bruno
07-14-2010, 12:09 AM
#2
Race Director
It could be a number of things
we need more info on what his car is doing
I also had a code 61 and I am removing the secondary system!
he can have a new chip burned by zr1 specialist www.zr1specialist.com
we need more info on what his car is doing
I also had a code 61 and I am removing the secondary system!
he can have a new chip burned by zr1 specialist www.zr1specialist.com
07-14-2010, 06:10 AM
#3
Le Mans Master
Member Since: Oct 2004
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The diagram from the link you gave pretty well covers the secondary vacuum circuit.
Once the car is running, the engine provides the vacuum. However, there is the external pump that you hear come on when the key is turned on w/o starting the engine. Normally, it runs for a few seconds and then shuts off. If it continues to run, disconnect the fitting where the vacuum line goes under the plenum and see if the pump is working by placing your thumb over the tube going to the pump. The pump should shut off in a second or so. If not, then the pump or the line/connectors are at issue.
If the pump is OK, then you'll have to connect a vacuum gauge/hand pump to the line going under the plenum and check for a leak. If you don't find a leak, then that connector joining the pump at the plenum is bad. Some RTV Silicone will seal it up - good as new.
If there is a leak under the plenum, then the plenum has to come off - not a big deal, but you'll want to have some gaskets handy. (Jerry's Gaskets.com work very well.) Then you'll have to go from point to point, checking everything, eliminating the components systematically. And, don't forget to check the line leading to the vacuum sensor that signals the ECM. (I'm not sure where it is on a 91. (On a 90 the vacuum line runs to the sensor switch under the ECM.)
Gotta go to work, but will have more time later. For me, after my second plenum pull for a vacuum leak, I removed all the secondary hardware and bought a chip from Marc Haibeck (as suggested) and goodbye vacuum issues!
P.
Once the car is running, the engine provides the vacuum. However, there is the external pump that you hear come on when the key is turned on w/o starting the engine. Normally, it runs for a few seconds and then shuts off. If it continues to run, disconnect the fitting where the vacuum line goes under the plenum and see if the pump is working by placing your thumb over the tube going to the pump. The pump should shut off in a second or so. If not, then the pump or the line/connectors are at issue.
If the pump is OK, then you'll have to connect a vacuum gauge/hand pump to the line going under the plenum and check for a leak. If you don't find a leak, then that connector joining the pump at the plenum is bad. Some RTV Silicone will seal it up - good as new.
If there is a leak under the plenum, then the plenum has to come off - not a big deal, but you'll want to have some gaskets handy. (Jerry's Gaskets.com work very well.) Then you'll have to go from point to point, checking everything, eliminating the components systematically. And, don't forget to check the line leading to the vacuum sensor that signals the ECM. (I'm not sure where it is on a 91. (On a 90 the vacuum line runs to the sensor switch under the ECM.)
Gotta go to work, but will have more time later. For me, after my second plenum pull for a vacuum leak, I removed all the secondary hardware and bought a chip from Marc Haibeck (as suggested) and goodbye vacuum issues!
P.
07-14-2010, 07:46 AM
#4
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Member Since: Sep 2009
Location: Sherbrooke Quebec
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The diagram from the link you gave pretty well covers the secondary vacuum circuit.
Once the car is running, the engine provides the vacuum. However, there is the external pump that you hear come on when the key is turned on w/o starting the engine. Normally, it runs for a few seconds and then shuts off. If it continues to run, disconnect the fitting where the vacuum line goes under the plenum and see if the pump is working by placing your thumb over the tube going to the pump. The pump should shut off in a second or so. If not, then the pump or the line/connectors are at issue.
If the pump is OK, then you'll have to connect a vacuum gauge/hand pump to the line going under the plenum and check for a leak. If you don't find a leak, then that connector joining the pump at the plenum is bad. Some RTV Silicone will seal it up - good as new.
If there is a leak under the plenum, then the plenum has to come off - not a big deal, but you'll want to have some gaskets handy. (Jerry's Gaskets.com work very well.) Then you'll have to go from point to point, checking everything, eliminating the components systematically. And, don't forget to check the line leading to the vacuum sensor that signals the ECM. (I'm not sure where it is on a 91. (On a 90 the vacuum line runs to the sensor switch under the ECM.)
Gotta go to work, but will have more time later. For me, after my second plenum pull for a vacuum leak, I removed all the secondary hardware and bought a chip from Marc Haibeck (as suggested) and goodbye vacuum issues!
P.
Once the car is running, the engine provides the vacuum. However, there is the external pump that you hear come on when the key is turned on w/o starting the engine. Normally, it runs for a few seconds and then shuts off. If it continues to run, disconnect the fitting where the vacuum line goes under the plenum and see if the pump is working by placing your thumb over the tube going to the pump. The pump should shut off in a second or so. If not, then the pump or the line/connectors are at issue.
If the pump is OK, then you'll have to connect a vacuum gauge/hand pump to the line going under the plenum and check for a leak. If you don't find a leak, then that connector joining the pump at the plenum is bad. Some RTV Silicone will seal it up - good as new.
If there is a leak under the plenum, then the plenum has to come off - not a big deal, but you'll want to have some gaskets handy. (Jerry's Gaskets.com work very well.) Then you'll have to go from point to point, checking everything, eliminating the components systematically. And, don't forget to check the line leading to the vacuum sensor that signals the ECM. (I'm not sure where it is on a 91. (On a 90 the vacuum line runs to the sensor switch under the ECM.)
Gotta go to work, but will have more time later. For me, after my second plenum pull for a vacuum leak, I removed all the secondary hardware and bought a chip from Marc Haibeck (as suggested) and goodbye vacuum issues!
P.
Ton anglais est très bien!
Je suis d'accord avec les commentaires de Paul. Mon père a eu un problème similaire avec ça '90 et tout était relié au vaccum du second systéme. La pompe ce situe à l'avant droite (position assit dans la voiture) sous le phare du capot. Souvent il sajit des tuyeaux de plastic noir qui s'use et crée une fuite. Solution, nous avons remplacé tout les tubes de plastic noir avec des tubes d'aluminium. Problème réglé!
Bonne chance et tiens nous au courant des résultats de votre recherche!
Martin
ZR-1 1991
(voir mon profil pour les photos)
Last edited by MRDZR1; 07-14-2010 at 07:51 AM.
07-14-2010, 07:55 AM
#5
6th Gear
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Ok , merci pour ton excellente reponse en French .
Je vais appeler mon ami et lui expliquer tout cela. J'espere qu'il trouvera. Sinon je reviendrai ici vous solliciter.
Hi thank's for your very good french respons
I'll phone to my friend to explain him. I hope he'll find the problem. Else i'll see you here again for your help.
Best regards
Bruno
07-14-2010, 07:59 AM
#6
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Ok , merci pour ton excellente reponse en French .
Je vais appeler mon ami et lui expliquer tout cela. J'espere qu'il trouvera. Sinon je reviendrai ici vous solliciter.
Hi thank's for your very good french respons
I'll phone to my friend to explain him. I hope he'll find the problem. Else i'll see you here again for your help.
Best regards
Bruno
PS: Je suis de la régions de Montréal, Québec. Alors essais de trouver un
avec drapeau Canadien! 
PS2: Bon réflex de garder tes commentaires en Anglais pour nos amis du USA! Ciao!
07-14-2010, 08:56 AM
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07-14-2010, 06:48 PM
#9
Melting Slicks
Salut mon ami!
Ton anglais est très bien!
Je suis d'accord avec les commentaires de Paul. Mon père a eu un problème similaire avec ça '90 et tout était relié au vaccum du second systéme. La pompe ce situe à l'avant droite (position assit dans la voiture) sous le phare du capot. Souvent il sajit des tuyeaux de plastic noir qui s'use et crée une fuite. Solution, nous avons remplacé tout les tubes de plastic noir avec des tubes d'aluminium. Problème réglé!
Bonne chance et tiens nous au courant des résultats de votre recherche!
Martin
ZR-1 1991
(voir mon profil pour les photos)
Ton anglais est très bien!
Je suis d'accord avec les commentaires de Paul. Mon père a eu un problème similaire avec ça '90 et tout était relié au vaccum du second systéme. La pompe ce situe à l'avant droite (position assit dans la voiture) sous le phare du capot. Souvent il sajit des tuyeaux de plastic noir qui s'use et crée une fuite. Solution, nous avons remplacé tout les tubes de plastic noir avec des tubes d'aluminium. Problème réglé!
Bonne chance et tiens nous au courant des résultats de votre recherche!
Martin
ZR-1 1991
(voir mon profil pour les photos)
What did he say?
Sheesh.
Looks like those french have a different word for everything!
( Good to see someone could help him out! )
Marty
1FUNZR1
07-14-2010, 10:36 PM
#10
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Yes much fun to see that we have buds in France that enjoy our old world class sports car! Here in Quebec we speak French and English is our second language. I also work with Japanese dudes (Toyota plants) and my daugthers spent a year in a private school in Mexico so guess what! I'm a bit confused with language now! 
07-15-2010, 10:31 AM
#11
code 61
Pull the hose at pump and plug if pump quits reinstall hose & pull plenum and check all connections and valves plugging open hose ends to man.diff.sensor & plenum to confirm vacuum again. If still running pull the sec. vac. solenoid by the canister and block the hose connector, if pump stops the solenoid is bad. Replacement is available with bracket mod.
Good Luck,
Gene in Fl.
Good Luck,
Gene in Fl.