Car might be sick,need some advice. - ZR-1 Net Registry Forums

Z51JEFF · 02-03-2013

The Service Engine Soon light came on while driving the car today and Im trying to figure out why.When this is lite does the power default to Valet Mode?Earlier today I washed the car.Afterwards,I went for a drive and noticed the light on then a few minutes later the car started to lose power.My first thought was I might have gottin water in the gas tank.I havent driven the car much in the last month and know things get funny when a car isnt drivin.I disconnected the battery,twice and the second time the light didnt come back on.I guess the easiest thing to have done would have looked for a stored code before I disconnected the battery.When the car wasnt running right I took it up through the gears and the car definitely wasnt running at full power.

WVZR-1 · 02-03-2013

Using this diagnostic tool I'd check for stored codes in the ECM and the CCM and move on from there. There's no need to just start "poking around"! The instructions are very straight forward and there's a good bit of information that's easily accessible

http://tech.corvettecentral.com/2011...trouble-codes/

Paul Workman · 02-03-2013

Quote:

Originally Posted by WVZR-1

Using this diagnostic tool I'd check for stored codes in the ECM and the CCM and move on from there. There's no need to just start "poking around"! The instructions are very straight forward and there's a good bit of information that's easily accessible

http://tech.corvettecentral.com/2011...trouble-codes/

I agree.

Jeff: By far, the best tool I ever bought for the Z. after the Factory Service Manual, is the scanner. Paid for itself many times over, it has. And it has allowed me to keep a little more of my hair!

In the mean time, you can refer to the FSM (you do have a manual, right?). Using a paper clip and the ALDL connector, the FSM can guide you through the procedure for pulling codes from the ECM. In the mean time, what is the voltage across the battery, if I may ask?

Far as loosing power, for sure the secondaries are cut off anytime there is a SYS light on.

P.

GOLDCYLON · 02-03-2013

Yep Jeff pull the codes it will save you time in the long run

scottfab · 02-03-2013

Does the SYS light stay on all the time now or does it go out?
You say you washed the car.
Did you get water on the motor much?
With the ing key on but motor not running, does the pump under
the headlight on the passenger side keep running almost all the time?

Z51JEFF · 02-03-2013

Quote:

Originally Posted by scottfab

Does the SYS light stay on all the time now or does it go out?
You say you washed the car.
Did you get water on the motor much?
With the ing key on but motor not running, does the pump under
the headlight on the passenger side keep running almost all the time?

No water under the hood,VAC pump is fine.I haven't been driving the car alot lately,maybe its pissed that the other cars been getting all the love.

Z51JEFF · 02-06-2013

The saga continues.Drove the car abit Sunday,get in the car after it sat for a few hours and the light comes on and the car was off-on would barely run.I pulled into a parking lot to check for codes and found none,get C12 which I believe is no codes stored.Started the car,light is out and car is running fine.The next day I checked the MAP sensor hose and it was full of oil.I replaced it with an NOS piece I had so far no issues.Ill post up with my findings if it continues.Thanks to all for the suggestions.

scottfab · 02-06-2013

Quote:

Originally Posted by Z51JEFF

The saga continues.Drove the car abit Sunday,get in the car after it sat for a few hours and the light comes on and the car was off-on would barely run.I pulled into a parking lot to check for codes and found none,get C12 which I believe is no codes stored.Started the car,light is out and car is running fine.The next day I checked the MAP sensor hose and it was full of oil.I replaced it with an NOS piece I had so far no issues.Ill post up with my findings if it continues.Thanks to all for the suggestions.

You may have found it then. Hope so. Oil in there is common and effects drive-ability. I routed mine such that the middle of the hose is the high point to avoid oil in there.

Z51JEFF · 02-10-2013

Problem still persists.After checking for codes I get C12 then about 5 seconds later I get H31.Will a battery acting up cause the SERVICE ENGINE light to come on and cause the stumble?

Brad Sewell · 02-11-2013

Someone with far more knowledge should chime in, but in my limited experience with this car any sub-par power supply can promote any number of challenges -- some non-repeatable.

02-03-2013	#1
Z51JEFF Join Date: Dec 2007 Location: Fremont, CA Posts: 3,087	Car might be sick,need some advice. The Service Engine Soon light came on while driving the car today and Im trying to figure out why.When this is lite does the power default to Valet Mode?Earlier today I washed the car.Afterwards,I went for a drive and noticed the light on then a few minutes later the car started to lose power.My first thought was I might have gottin water in the gas tank.I havent driven the car much in the last month and know things get funny when a car isnt drivin.I disconnected the battery,twice and the second time the light didnt come back on.I guess the easiest thing to have done would have looked for a stored code before I disconnected the battery.When the car wasnt running right I took it up through the gears and the car definitely wasnt running at full power.

02-03-2013	#2
WVZR-1 Join Date: Oct 2004 Posts: 1,884	Re: Car might be sick,need some advice. Using this diagnostic tool I'd check for stored codes in the ECM and the CCM and move on from there. There's no need to just start "poking around"! The instructions are very straight forward and there's a good bit of information that's easily accessible http://tech.corvettecentral.com/2011...trouble-codes/

02-03-2013	#4
GOLDCYLON Join Date: May 2007 Location: Peoria, AZ Posts: 9,120	Re: Car might be sick,need some advice. Yep Jeff pull the codes it will save you time in the long run __________________ 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

02-03-2013	#5
scottfab Join Date: Jan 2009 Location: Portland Oregon metro area (Washington side) Posts: 3,193	Re: Car might be sick,need some advice. Does the SYS light stay on all the time now or does it go out? You say you washed the car. Did you get water on the motor much? With the ing key on but motor not running, does the pump under the headlight on the passenger side keep running almost all the time? __________________ Scott Vett owner since 1979._It's about the car and the people

02-06-2013	#7
Z51JEFF Join Date: Dec 2007 Location: Fremont, CA Posts: 3,087	Re: Car might be sick,need some advice. The saga continues.Drove the car abit Sunday,get in the car after it sat for a few hours and the light comes on and the car was off-on would barely run.I pulled into a parking lot to check for codes and found none,get C12 which I believe is no codes stored.Started the car,light is out and car is running fine.The next day I checked the MAP sensor hose and it was full of oil.I replaced it with an NOS piece I had so far no issues.Ill post up with my findings if it continues.Thanks to all for the suggestions.

02-10-2013	#9
Z51JEFF Join Date: Dec 2007 Location: Fremont, CA Posts: 3,087	Re: Car might be sick,need some advice. Problem still persists.After checking for codes I get C12 then about 5 seconds later I get H31.Will a battery acting up cause the SERVICE ENGINE light to come on and cause the stumble?

02-11-2013	#10
Brad Sewell Join Date: Feb 2012 Location: Wilmington, NC Posts: 55	Re: Car might be sick,need some advice. Someone with far more knowledge should chime in, but in my limited experience with this car any sub-par power supply can promote any number of challenges -- some non-repeatable.