Ignition problems

[roanokeSpider]

I just recieved my new ignition installed it today. The problem is that the fuel pump runs constantly at any key position but there could be other problems unknown to me (It does run smoothly once started). The old factory one has 8 prongs and this new one has 6. I've used 2 wiring diagrams haynes and brad artigues problem with brad's is its for as 77 and i have a 76. Im not sure what to do other than send this one back and try another. Any ideas?

[mdrburchette]

I would be asking the vendor for information or looking at the wiring diagrams you have available to find the prong that is only activated when the key is turned to the on position.

[roanokeSpider]

Where can i find a correct ignition for my 76 all the ones ive seen and bought are for mechanical fuel pumps having 6 terminals instead of my electric fuel pump which has 8 terminals. I guess i could wire it up with one of those lada ignitions with a fuel pump kill switch since it runs non stop when hooked up to that ignition no matter where the key is. Thanks

[brunorahl]

The pump isn't wired directly to your ignition. It's switched by your multi-relay. That is triggered by the air flow meter. If there was no trouble before the new ignition switch, then start with it. Call the people you purchased it from and get them to e-mail you the correct wiring. Follow the instructions. Guessing could blow fuses or melt wires.

[So Cal Mark]

76s are carbed, not FI so there isn't a dual relay for the pump

[brunorahl]

My mistake. My brain just went to to the EFI systems and their system.

Get the wiring diagram for your ignition switch

[zachmac]

On a 76 with an electric fuel pump the pump should not intially run when you first switch the key on (unless there is residual oil pressure, more on this in a sec). When you go to "crank" it completes a path for power from the ign. switch to the pump to allow it to run to get the car started. THEN a switch senses oil presuure build up and allows for power from the fuel pump relay (a single relay NOT to be confused with the FI car's dual relay) to maintain the power to the pump, provided the ign. switch is on and the oil pressure remains. If your pump is running continuously it may simply be that the oil pressure sensor has faiked closed. The sensor is SEPARATE from the one that feeds the guage / oil pressure light so that coming on and then clearing after start doesn't tell you if the sensor for the pump relay is working or not.

Do you have wiring diagrams for the 76? I am about to take ownership of one so I found them. If you need them PM me.

[roanokeSpider]

The oil pressure sensor is brand new and im not sure that the pressure has anything to do with the fuel pump. My pump has always run when the key is on the ON position or turned to crank the engine over but never when in the off position like it is now with the new (lada) ignition. And I have tried using a wiring diagram which is correct for all the cranking wires. I might just wire in a kill switch on the fuel pump but would rather have it stock.

[zachmac]

Well, according to the wiring diagrams it shouldn't run unless you are in "on" or "cranking". Also the wiring definitley shows a tie with an oil pressure sensor. In theroy if you lose oil pressure while in run the relay should de-energize killing the fuel pump and stopping (and thereby minimizing damage to) you engine. This is NOT the same as the sendor that controls the guage / idiot ;ight. Thereis a separate one for the FP relay. BUT, what you describe is definitely NOT correct. It certainly shouldn't run when in "off". Clearly the current switch / wiring has the hot feed to the ign. switch routing to the FP all the time; and most likely via the "cranking" path versus the running path as I doubt the relay is picking up without oil pressure.

Try this, locate the FP relay under the hood. With the FP running in the "off" position pull the ground wire on the relay and see if the pump still runs. That will tell us which power supply (relay or cranking) is making the pump run. You'll need to know this anyway to wire your manual kill.