3.5 efi conversion to 3.9 efi

damiancorrine · May 9, 2017

Read a bit on this but everyone seems to track off into other issues .

Is this a straight swap ?
What might I need to have ? Need ?
3.9 out of a manual and 3.5 is auto ?

Feeling head gasket gone on 3.5 despite all its other issues and offered a 3.9 for £150

Cheers

pete1987RRC · May 12, 2017

Don't do it!

3.5 is the most robust engine, all the others have liner issues.

If you do have you got the different ecu to fit also?

jamesmartin · May 12, 2017

damiancorrine said:
Read a bit on this but everyone seems to track off into other issues .

Is this a straight swap ?
What might I need to have ? Need ?
3.9 out of a manual and 3.5 is auto ?

Feeling head gasket gone on 3.5 despite all its other issues and offered a 3.9 for £150

Cheers

id put the 3.9 efi and cam in the 3.5

damiancorrine · May 12, 2017

We have a 3.9 sort of built trialer with a 3.9 never any issues . The other hybrid we bought with a 3.5 efi has never run right since we bought it .... bad starting .. rough running ... no power and sluggish ... **** idle all over the place . Starts one day and then never again until it feels like it . Also compressions are a bit out on 2 cylinders 175 on 6 and 155 on other 2 . Purchased new rotor new cap new plugs new leads , checked timing with piston 1 up and rotor facing it .... won't start ... tdc marks are nowhere near each other on fly wheel with piston 1 up .... spark seems ok at plugs ... fuel coming out of pipe pre fuel reg when undone ..... vacuum pipes with bolts in ... vacuum pipe off fuel regulator goes to nothing ... all bit of a mess really ... has run and was moved ... week.later not a sausage ... easy start down.plenium in and not a sausage ... sort of giving up

pete1987RRC · May 14, 2017

jamesmartin said:
id put the 3.9 efi and cam in the 3.5

Allready done that, well the cam anyway.

Still on 3.5 flapper EFI but running gas most of the time

pete1987RRC · May 14, 2017

damiancorrine said:
We have a 3.9 sort of built trialer with a 3.9 never any issues . The other hybrid we bought with a 3.5 efi has never run right since we bought it .... bad starting .. rough running ... no power and sluggish ... **** idle all over the place . Starts one day and then never again until it feels like it . Also compressions are a bit out on 2 cylinders 175 on 6 and 155 on other 2 . Purchased new rotor new cap new plugs new leads , checked timing with piston 1 up and rotor facing it .... won't start ... tdc marks are nowhere near each other on fly wheel with piston 1 up .... spark seems ok at plugs ... fuel coming out of pipe pre fuel reg when undone ..... vacuum pipes with bolts in ... vacuum pipe off fuel regulator goes to nothing ... all bit of a mess really ... has run and was moved ... week.later not a sausage ... easy start down.plenium in and not a sausage ... sort of giving up

Sounds like a methodical approach to the issues is required. What age efi system is it?

damiancorrine · May 15, 2017

It's I a hybrid not sure of age as listed as 1972 series 3 . Imagine late 80s early 90s.I have booked a mobile mechanic for 4 hrs to see if can get a fresh perspective and Start from beginning and guess work our way through .

damiancorrine · May 28, 2017

3.5 started .. starts off the key .. ticks over smooth .... as soon as driven starts bogging down and farting and belching .... foot to floor try to pick up and go ... then cough and splutters ...

3.5 efi conversion to 3.9 efi

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