trouble with my zr1
 

Since i am new at this forum i thought i could tell you guys a little bit about my car and it might also explane some of my troubles with it.

Its a 89 mod zr1 low milage its been rebuilt and is a convertible now, the guy that has done the rebuilding has not done a good job when it comes to the cabels and routing.

I have used a couple of weeks getting the car up and running(it was not complete when i bought it) have been reading alot on this forum and learned very much.

First test drives went great ful power and a big smil on my face but today my vacuum pump for this secondery system went silent , i have no power to the pump, is there a unit that controls this pump or a relay somewhere?

Also got code 61 and 22 any thoughts from the experts ??

Re: trouble with my zr1
 

an '89 ZR1 convertible? Any pictures?

Re: trouble with my zr1
 

I'd love to see some pics of this car. sounds like quite the rare one.

Re: trouble with my zr1
 

Code 61 & 22 are telling you that the secondary solenoid is not functional.

<stolen from a un-named internet forum>
When DTC Code 61 sets, engine rpm is limited to 3K.

A vacuum sensor located under the plenum monitors how much vacuum is applied to the secondary actuators. By monitoring the Vacuum Sensor voltage output, the ECM knows how much vacuum is present.

During Full Power Mode when the secondary solenoid opens, the Secondary vacuum pump turns on at around 41 kPa/ 12hg to supplement engine vacuum. DTC61 will set if the vacuum drops below 21kPa.

During Normal engine power operation DTC 61 will set if any vacuum is present at the secondary valve actuators.

DTC 61 will set
Secondary air inlet valves are commanded closed (Secondary Solenoid closed) and vacuum sensor signal is between .74volts and 4.89 volts.

Secondary air inlet valves are commanded open (Secondary solenoid open) and vacuum sensor signal is less than 1.7 volts.

ECM monitors the secondary valve actuator sensor on the ECM Red connector Pin 12 a Gray/Black wire.

Here is everything you need to know about your secondary port vacuum system:
http://corvetteactioncenter.com/foru...ad.php?t=14272

There is a 10amp fuse in the Instrument Panel fuse block, I don't know exactly which one it is.

TomC

Re: trouble with my zr1
 

This one I gotta see, too. Please post picks.

Re: trouble with my zr1
 

Sure like to know the car vin and engine s/n on this one.

Re: trouble with my zr1
 

Sounds like a cool custom! Must have pics :-) we like pics :-)

Re: trouble with my zr1
 

http://home.online.no/~btonhe/pitures2.cfm

Go to pictures and at the bottom is a few of the zr1.

Re: trouble with my zr1
 

Just a shot in the dark on the vac pump. There is a replacement part from a truck that GMC makes that will work....I'll look up the part number and post it for you when I get a chance...you have to change the plug on the pump as it is not the same as the set up in a ZR-1 wiring harness, but the pump is the same pump with a different P/N because it is from a GMC truck....oh, forgot this: a VW V6 Golf(?) or GTI(?)V6 uses the same pump also. It's a german brand pump, Bosch maybe???

Anyway, your pump may have stopped due to mositure corroding the pump motor. You can take the pump apart and disassemble the motor to clean it up and reassemble and it just might work....I did it to mine & so far it's been good. It's a really simple electric motor and simple wiring that will require some soldering skill to take it apart & reassemble. A little contact cleaner aerosol and some WD40 and some 1500 grit wet paper or crocus cloth and I used di-electric grease as a lube & moisture barrier is all you should need. My motor seized up & toasted the plug, which stopped the pump from working...and it didn't blow the fuse...I even got away with cleaning up the plug contacts and didn't have to splice in any new wire. Just a thought , if the fuse for the pump is good, unplug the power connection at the pump and look to see if it is semi-melted. If it is, chances are that the motor froze up from moisture intrusion.

:cheers:
Tom

Re: trouble with my zr1
 

I think the pump is ok but its good to know its possible to get a replacement pump,i took of the plug and measured the power with the vacuum hose of and i have 0 volts.
From reading other threads i understand that this pump should be running non stop with the hose disconnected, i wil start with replacing the fuse(they all looks ok ) and see if i have power in , if there is power i am thinking a bad cable somewhere between the fuse box and the pump.
I dont have the manual ,i have ordered one and its on its way, can someone tell me which one of the fuses that goes for the vacuum pump?

This link is very good it help me understand how it all work :) thanks

http://corvetteactioncenter.com/foru...ad.php?t=14272