Engine mis-fire/ shutter / skip

[Motorsport-SVX]

Originally Posted by svx_commuter

I searched and found this,
Quote>>
The rule of thumb appears to be always suspect a ground fault, but I do not go along with such a simple approach. Surely if the TCU was not properly grounded several associated faults would show up.

N. B. ---- You are correct with the ground connections. The TCU is grounded via a black lead which goes all the way back to a common point within the transmission housing. This is done to prevent an earth loop which could otherwise result in interference signals on the high impedence input circuits. Do NOT attach a direct ground wire from the TCU to any other place.

I am swearing for you, Trevor.<<end Quote

Thanks Trevor (lurking?) and take care too,
John

Is the ground on the trans housing Obvious and
fairly simple to located ? Im going to check mine
tomorrow.

[svx_commuter]

Originally Posted by Motorsport-SVX

Is the ground on the trans housing Obvious and
fairly simple to located ? Im going to check mine
tomorrow.

Sorry I just read this three days late.

Once the plastic air intake hose to the TB is out the connection is very visible. It is actually a bare braded wire with spade type connector on my SVX. One end is bolted to the middle of firewall and other end is right on top of the AT in the middle. It does get coroded and blueish green looking. Mine came apart way to easy.

The SVX has many ground wires and I think this wire supplements the normal grounding that takes place between the engine block and transmission housing. It will be interesting to know if it fixes your problem.

[Motorsport-SVX]

replaced the ground (which hasnt been connected for 2 yrs ) today on the rear muffler
and installed a thin 4 gauge ground on the firewall to
the motor.
Now while trying to start the car, when cranking it
It turns over and cranks fine, but all the relays click
wildly, the electric fans etc turn off and on in sync to
the relays, and the check engine lite flashes also at
the same time, and the car wont start....
hmmm..
Changing the engine temp sensor in the am.
any other ideas ?

[svx_commuter]

Originally Posted by Motorsport-SVX

replaced the ground (which hasnt been connected for 2 yrs ) today on the rear muffler
and installed a thin 4 gauge ground on the firewall to
the motor.
Now while trying to start the car, when cranking it
It turns over and cranks fine, but all the relays click
wildly, the electric fans etc turn off and on in sync to
the relays, and the check engine lite flashes also at
the same time, and the car wont start....
hmmm..
Changing the engine temp sensor in the am.
any other ideas ?

I made my SVX do this a couple of times over the years. It was when I reading and clearing codes out of the ECU and got the sequence out of order.

I recommend getting the codes read on your 97.

Then if all the sensor are okay try disconnecting the (-)battery overnight, reconnectin the morning and let it idle for 20 minutes without touching the gas. I did this a few days ago and I think everything has reset including the TCU. It was a little rough starting the first two days after doing this but everything is fine now.

[Motorsport-SVX]

Originally Posted by svx_commuter

I made my SVX do this a couple of times over the years. It was when I reading and clearing codes out of the ECU and got the sequence out of order.

I recommend getting the codes read on your 97.

Then if all the sensor are okay try disconnecting the (-)battery overnight, reconnectin the morning and let it idle for 20 minutes without touching the gas. I did this a few days ago and I think everything has reset including the TCU. It was a little rough starting the first two days after doing this but everything is fine now.

Im trying that next, disconnecting the battery etc
today
the new sensor is installed

[Hocrest]

Bringing this post back from the dead.

I'm looking at someone's SVX and it's having this problem. It is also noticably affected by turning on the heater. Did anyone else notice a connection to the heater???

[Trevor]

Originally Posted by Hocrest

Bringing this post back from the dead.

I'm looking at someone's SVX and it's having this problem. It is also noticably affected by turning on the heater. Did anyone else notice a connection to the heater???

Turning on the heater (air conditioning?), will send a signal to the By-Pass Air Control Solenoid Valve, to increase air flow at idle in order to compensate for the extra power required to operate the air conditioning compressor.

[Hocrest]

I found two coil packs that were causing problems. It seems to have taken care of it...

[svxfiles]

Originally Posted by Hocrest

I found two coil packs that were causing problems. It seems to have taken care of it...

Glad to hear it!

[Octanerush]

Originally Posted by Motorsport-SVX

replaced the ground (which hasnt been connected for 2 yrs ) today on the rear muffler
and installed a thin 4 gauge ground on the firewall to
the motor.
Now while trying to start the car, when cranking it
It turns over and cranks fine, but all the relays click
wildly, the electric fans etc turn off and on in sync to
the relays, and the check engine lite flashes also at
the same time, and the car wont start....
hmmm..
Changing the engine temp sensor in the am.
any other ideas ?

anyone know where the ground wire from the muffler goes to?? and does this have anything to do with stalling problems??

[svxfiles]

Originally Posted by Octanerush

anyone know where the ground wire from the muffler goes to?? and does this have anything to do with stalling problems??

The ground wire goes from the passenger side muffler to the inner fender, and usually I would say it has nothing to do with the stalling, but at least once in SVX history, a bad muffler groung stoped an SVX from running!
Hocrest and benebobs race car!