motor swap complete, now I could use advice on backfire. - Ford Mustang Forum
 
LinkBack Thread Tools
post #1 of 9 (permalink) Old 06-14-2014 Thread Starter
Rookie
 
C88 villain's Avatar
 
Joined: Jan 2014
Location: newton
Posts: 11
 
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.
C88 villain is offline  
Sponsored Links
Advertisement
 
post #2 of 9 (permalink) Old 06-14-2014
SHELBY GT 350 Member
 
wmburns's Avatar
 
Joined: Sep 2010
Location: Houston
Posts: 5,196
       
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.

2003 GT Convertible (sold & missed)
2000 GT coupe (Craigslist project. Fixed. Now my DD). Windsor to Romeo swap.
wmburns is offline  
post #3 of 9 (permalink) Old 06-14-2014 Thread Starter
Rookie
 
C88 villain's Avatar
 
Joined: Jan 2014
Location: newton
Posts: 11
 
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.
C88 villain is offline  
post #4 of 9 (permalink) Old 06-14-2014
SHELBY GT 350 Member
 
wmburns's Avatar
 
Joined: Sep 2010
Location: Houston
Posts: 5,196
       
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.

2003 GT Convertible (sold & missed)
2000 GT coupe (Craigslist project. Fixed. Now my DD). Windsor to Romeo swap.
wmburns is offline  
post #5 of 9 (permalink) Old 06-14-2014 Thread Starter
Rookie
 
C88 villain's Avatar
 
Joined: Jan 2014
Location: newton
Posts: 11
 
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.
C88 villain is offline  
post #6 of 9 (permalink) Old 06-14-2014
SHELBY GT 350 Member
 
wmburns's Avatar
 
Joined: Sep 2010
Location: Houston
Posts: 5,196
       
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".

2003 GT Convertible (sold & missed)
2000 GT coupe (Craigslist project. Fixed. Now my DD). Windsor to Romeo swap.
wmburns is offline  
post #7 of 9 (permalink) Old 06-14-2014 Thread Starter
Rookie
 
C88 villain's Avatar
 
Joined: Jan 2014
Location: newton
Posts: 11
 
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
C88 villain is offline  
post #8 of 9 (permalink) Old 06-14-2014
SHELBY GT 350 Member
 
wmburns's Avatar
 
Joined: Sep 2010
Location: Houston
Posts: 5,196
       
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.

2003 GT Convertible (sold & missed)
2000 GT coupe (Craigslist project. Fixed. Now my DD). Windsor to Romeo swap.
wmburns is offline  
post #9 of 9 (permalink) Old 06-14-2014 Thread Starter
Rookie
 
C88 villain's Avatar
 
Joined: Jan 2014
Location: newton
Posts: 11
 
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.
C88 villain is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Ford Mustang Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a VALID email address for yourself, otherwise you will not receive the necessary confirmation email needed to confirm, validate and activate your new AFM member account.

Failure to provide a VALID email address, will result in the cancellation of your new AFM member account registration.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome


1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183