97 GTX running on one cylinder

[Hambone059]

I have a 97 GTX just put a new SBT engine in it. It will start but not idle up. when I checked the plugs it looks like the front cylinder is firing but the back is not. I put carb. kit in. but cant tell if its getting gas or not. Best I could tell in the sunlight it was getting a spark. anyhelp would be appreciated. thanks.

[Craig_Canada]

Re: 97 GTX running on one cylinder

Did you check compression?

[dsolie]

Re: 97 GTX running on one cylinder

Did you rebuild the carbs correctly (it's a dual carb right?)?

Did you check the pop-off of the carbs? If your pop-off on the rear carb is too high, then it won't allow fuel into the fuel circuits, hence, not getting fuel into the motor.

Also, is it timed correctly?

[Hambone059]

Re: 97 GTX running on one cylinder

Thanks for the replies. I did rebuild the carbs but have not checked the pop off pressure. I have a feeling thats the problem. is there a way to check with out buying special equip.?

[dsolie]

Re: 97 GTX running on one cylinder

Not really.. The gauge is not too expensive. You can always pull the carbs and take them into a local dealer and ask them to check the PO. Takes all of 5 minutes to do, but it is the difference between your motor running, or not running.