Looking for Help - ZR-1 Net Registry Forums

ctgreg · 03-10-2010

Hey all,

I had my 1990 out yesterday for a drive and all of a sudden the SES came on. I drove home and ran through a few things. One thing I noticed is that the vacuum pump is running non-stop when ignition is in the "on" position, but it appears that it's not running when car is running. I pulled a Code 16, but for some reason I can't seem to correlate one issue w/ the other. I tried clearing code, but no go.

I also checked all vacuum connections and I can hear one connection in under left front of plenum where two line are attached.

Any and all advice would be greatly appreciated.

Thanks in advance,
Greg

jonszr1 · 03-10-2010

sounds like you should pull the plenum to find the leak.if you havent done it its really easy .do you have a factory service manual? also before you pull it order a set of gaskets from jerrys gaskets . hope this helps . ps i am unsure about why you pump doesnt work with the engine running

03-11-2010

Code 16 is a DIS system fault. You need to get a manual and follow the diag tree.

The vacuum pump running is a issue in the fact that you do have a massive leak, but the engine when running creates enough natural vacuum to keep the tank stored. If you did get into the secondary system for a lengthy time, you would set a SES light for that as well.

ctgreg · 03-11-2010

Quote:

Originally Posted by Jeffvette

Code 16 is a DIS system fault. You need to get a manual and follow the diag tree.

The vacuum pump running is a issue in the fact that you do have a massive leak, but the engine when running creates enough natural vacuum to keep the tank stored. If you did get into the secondary system for a lengthy time, you would set a SES light for that as well.

Thanks,

I have the manual, but for some reason, the vacuum issue doesn't equate w/ code 16. I'll have to dig deeper.

Greg

ZZZZZR1 · 03-11-2010

Quote:

Originally Posted by ctgreg

Thanks,

I have the manual, but for some reason, the vacuum issue doesn't equate w/ code 16. I'll have to dig deeper.

Greg

Greg,

Are you busy on the 27th of March? We have a get together and "tearing down an LT5" then!

http://www.zr1.net/forum/showthread.php?t=11189

Hope you can come out and meet our group!!!!!

David

03-11-2010

Quote:

Originally Posted by ctgreg

Thanks,

I have the manual, but for some reason, the vacuum issue doesn't equate w/ code 16. I'll have to dig deeper.

Greg

They don't equate. Troubleshoot separate.

Hotrod · 04-08-2010

There is a small check valve on the vacuum pump hose, under the plenum, to prevent the pump from trying to pull a vacuum while the engine is stopped. Sometimes this valve goes bad. Try disconnecting to line at the fitting where it goes under the plenum, drivers side, and place your finger over the line (non plenum side) and see if the pump stops running. If so, you can add a small check valve to the line, in series, and prevent having to pull the plenum.

ctgreg · 04-09-2010

Quote:

Originally Posted by Hotrod

There is a small check valve on the vacuum pump hose, under the plenum, to prevent the pump from trying to pull a vacuum while the engine is stopped. Sometimes this valve goes bad. Try disconnecting to line at the fitting where it goes under the plenum, drivers side, and place your finger over the line (non plenum side) and see if the pump stops running. If so, you can add a small check valve to the line, in series, and prevent having to pull the plenum.

Thanks Rod...already fixed. I think something got really wet when I rinsed the car off at the car wash. I recently checked codes and got a secondary code 61. Seems fine now.

Greg

GOLDCYLON · 04-12-2010

So your still getting a code 61 ? Or???

Im getting an intermitent code 61 that wont hard set SES will illuminate then go away. Im wondering if my vacuum pump is bad? From what I read in the FSM if the pressure on the secorndary actuators hits a set point the pump is suposed to kick in to maintain pressure. Anyone ? ?

scottfab · 04-12-2010

if pump stops when disconnecting hose etc as already mentioned then take the car for a drive and get into the secondaries for 10 or so seconds. If the HP drops noticeably at about 8 or so seconds then there is a problem with the vacuum getting to the actuator(s) or the secondary fuel pump is failing.

03-10-2010	#1
ctgreg Join Date: Sep 2009 Location: Shepherdstown Posts: 19	Looking for Help Hey all, I had my 1990 out yesterday for a drive and all of a sudden the SES came on. I drove home and ran through a few things. One thing I noticed is that the vacuum pump is running non-stop when ignition is in the "on" position, but it appears that it's not running when car is running. I pulled a Code 16, but for some reason I can't seem to correlate one issue w/ the other. I tried clearing code, but no go. I also checked all vacuum connections and I can hear one connection in under left front of plenum where two line are attached. Any and all advice would be greatly appreciated. Thanks in advance, Greg

03-10-2010	#2
jonszr1 Join Date: Sep 2006 Location: lone pine and mammoth lakes Posts: 1,407	Re: Looking for Help sounds like you should pull the plenum to find the leak.if you havent done it its really easy .do you have a factory service manual? also before you pull it order a set of gaskets from jerrys gaskets . hope this helps . ps i am unsure about why you pump doesnt work with the engine running

03-11-2010	#3
Jeffvette Guest Posts: n/a	Re: Looking for Help Code 16 is a DIS system fault. You need to get a manual and follow the diag tree. The vacuum pump running is a issue in the fact that you do have a massive leak, but the engine when running creates enough natural vacuum to keep the tank stored. If you did get into the secondary system for a lengthy time, you would set a SES light for that as well.

04-08-2010	#7
Hotrod Join Date: Sep 2005 Posts: 9	Re: Looking for Help There is a small check valve on the vacuum pump hose, under the plenum, to prevent the pump from trying to pull a vacuum while the engine is stopped. Sometimes this valve goes bad. Try disconnecting to line at the fitting where it goes under the plenum, drivers side, and place your finger over the line (non plenum side) and see if the pump stops running. If so, you can add a small check valve to the line, in series, and prevent having to pull the plenum.

04-12-2010	#9
GOLDCYLON Join Date: May 2007 Location: Peoria, AZ Posts: 9,153	Re: Looking for Help So your still getting a code 61 ? Or??? Im getting an intermitent code 61 that wont hard set SES will illuminate then go away. Im wondering if my vacuum pump is bad? From what I read in the FSM if the pressure on the secorndary actuators hits a set point the pump is suposed to kick in to maintain pressure. Anyone ? ? __________________ GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director 91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V

04-12-2010	#10
scottfab Join Date: Jan 2009 Location: Portland Oregon metro area (Washington side) Posts: 3,207	Re: Looking for Help if pump stops when disconnecting hose etc as already mentioned then take the car for a drive and get into the secondaries for 10 or so seconds. If the HP drops noticeably at about 8 or so seconds then there is a problem with the vacuum getting to the actuator(s) or the secondary fuel pump is failing. __________________ Scott Vett owner since 1979._It's about the car and the people