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Originally Posted by serpent_1977
I have a maxima, 94GXE. WE recently replaced the transmission,and as I was hooking all the electrical back up, I noticed a ground wire that bolts to the frame right above the driver's side wheel well. I ahve searched for about 3 days, and I cannot find where that wire plugs into. It is driving me nuts. We are having some problems with the engine (It is only running on 3 cylinders) and the mechanic Iwas working with thinks that ground might have somehting to do with it. If anyone knows where that plugs into, could you please let me know. Thanks for any help.
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Electrical devices need supply voltage. The current flow thru the device produces the energy for it. Thereby the flow needs a place to go. This is source to drain the current, is commonly called the ground.
Electronic devices are suspect to interference from spikes produced by powerful devices, like starter etc. Thereby they typically are isolated from this ground, and have their own gnd 'source'.
A car has battery (&alternator) and its negative pole -the gnd- is strapped to chassis and engine block. Typically this is enough on new and clean products. However, oxidation between various parts, result in disconnection and/or resistance inhibitng current flow.
The extra grounding straps ensure grounding between chassis and the engine parts. One part is the exhaust pipe, typically it has to be grounded cause the O2 sensor & other possible interference problems. Maybe your strap is for it?
Btw. Extra grounding from chassis to alternator is imperative. Manufacturers leave this device to ground itself just via its support bolts which will oxidize, question is just how fast. Oxidation will break this ground, and ruin battery as it will never become fully charged. Add one strap between alternator body and vehicle chassis - all connection points clean & electric conducting grease added.
In electrical devices, adding extra groundings will never do harm, only increases reliabiltity. In electronics one has to think also radio frequencies: a loop forms an antenna which may induce problems to the low voltage electronics devices. Thereby all electronics grounding cables networks must have to form a tree [never a loop].
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Btw. I do not think that gnd strap has no relation to u problem...
Listen to injectors: do they all click?
- If not, you're not getting any gas. Propably wiring to ECU. Clean all connectors with white carbon.
- If they do, check ingnition to those dead three by installing a spare plug and grounding the plug. A spark should be seen between gaps while engine running...