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Unread 06-14-2014   #1 (permalink)
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Default motor swap complete, now I could use advice on backfire.

I pulled a motor out of a 2007 crown vic with 39000 miles. Swapped it into my 2001 mustang gt (used mustang intake and throttle body and swapped to crown vic motor, yes I got new gaskets) started it up, idles fine but when you rev there is backfire. When I get it on the road it runs like a pig. Sluggish, feels like not enough gas. Can you swap those intakes with no problem? It bolted right up lol btw I know I'm getting a power loss by switching to cv motor but it's not much and there are plans for this car In the near future to gain all power back plus some.
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Unread 06-14-2014   #2 (permalink)
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Confirm that the Fuel pressure intake vacuum reference line is connected and leak free. Confirm that the Mustang's fuel pressure sensor was used.

Confirm that the Mustang's fuel injectors have been used.

Confirm that the Ground strap from the left hand motor mount to the frame rail has been installed.

Has the the alternator been tested for excessive AC ripple?

Tell us about any other parts from the CV that were used. The CV long block is the same as used in the Mustang. Should have same power if correct parts are used. IMO problem lies somewhere else.
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Unread 06-14-2014   #3 (permalink)
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Confirmed everything except for alternator test. Mustang coil on packs were used on cv. Injectors are from crown vic. Spark plugs are from c.v. ecu was never changed so ecu is from mustang. No vaccum leaks. There might be one thing though. Guy that helped, swapped my crank shaft position sensor from mustang motor to cv motor, butility forgot to count teeth on it before installing and I think this is where problem lies but I don't know how to change it.
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Quote:
Originally Posted by C88 villain View Post
Confirmed everything except for alternator test. Mustang coil on packs were used on cv. Injectors are from crown vic. Spark plugs are from c.v. ecu was never changed so ecu is from mustang. No vaccum leaks. There might be one thing though. Guy that helped, swapped my crank shaft position sensor from mustang motor to cv motor, butility forgot to count teeth on it before installing and I think this is where problem lies but I don't know how to change it.
The CV uses much smaller fuel injectors than the Mustang. IMO that would explain why it's feels like starving for gas. Recommend using the Mustang Fuel injector.

There aren't any alignment issues with installing the CKP sensor. Just put it in.
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Unread 06-14-2014   #5 (permalink)
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There's no issue at all with sensor? It's not stock. Think it may be an aftermarkrt piece by steeda. It allows me to go from 0 degrees to 20.
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Might be real handy to mention that. My crystal ball must be cloudy today. I now agree that the Steeda CKP sensor could be the source of the backfires.

Why not use the stock CKP sensor until all of the bugs are worked out? Or at the least install it "straight up".
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I tried installing stock sensor from before but there was really no change. I'm thinking the ckp maybe off a few teeth. I apologize for not mentioning before. Been a long work week friend lol
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Help me understand why you are holding on the number of teeth of the CKP sensor? Was the trigger removed? Is it using an external trigger wheel?

What's one of the causes of back fire? Timing. Seems likely to me that anything that affects timing on these motors should be looked at closely.
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I just figured it was the position of it. The guy forgot to count the teeth and now the car runs like crap. But I don't know how to go about fixing it. Thinking about going to shop cause I don't have time to pull timing cover off.
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