need help with 5.0 swap

[jtsmustang]

i did a swap on my 88 ranger but the motor is running like shit. i dont now what to do it idles like it has a huge cam in it but its a stock 89 mustang motor. runs ok at higher rpm's.

 

[baddad457]

Not enough info. MIght be anything from a vacuum leak to carb or ignition issues

 

[BlackBII]

Yeah dude more info...carbed? EFI?

Pulled codes? Firing on all cylinders? Vaccum leaks? etc.....

 

[jtsmustang]

its efi vacuum is at 17 which is normal, when it is idling it seems like its running on half cylinders but when i hit the gas it runs better.iv eliminated all smog and egr stuff. running some tests i tried unplugging the mass air sensor and nothing changed. i havent had a chance to pull codes yet but will soon.

 

[mikepotts]

have the ignition mod checked.

 

[jtsmustang]

its brand new

 

[93Ranger4x4]

just because it's brand new doesnt always mean its good,i've have a couple bad igniton modules before.

 

[jtsmustang]

ya i know i tried swapping it with a known good one still no change

 

[BlackBII]

Check the timing?

 

[jtsmustang]

its set to 10 degrees

 

[RangerFabWorks]

if it doesnt change disconnecting the maf, then its the maf, it shoul run worse with the maf disconnected

 

[jtsmustang]

swapped with a couple different maf sensors and hooked up a meter its reading right voltage

 

[fordmike1]

Do you have the BARO sensor hooked up? Remember since you have a mass air type system the map/baro sensor does not get any vacuum.

 

[jtsmustang]

yup have it open to atmosphere pressure. it doesnt make since.