halo_djk

We have a Ford XE Falcon, purchased 6 weeks ago that has developed a vilent vibration at around 1500 RPM.
It begins at about 1400, and tapers off to almost completely smooth again at 2000 RPM. Here's what we have discovered so far:

Th vibration IS via engine speed, not road speed and is not Tailshaft or Uni joints.

The vibration is just as violent under no load, in Park, at 1500RPM.

The engine is a 4.1L EFI motor runing on Autogas, Auto Trans. The motor was recently fitted, just before we purchased it. It seems to be running well, not missing we think, maybe just a little lumpy at idle.

It's got me completely bushed, and would be so thankful for any light or past experiences anyone can shed on this one. I'm starting to wonder if perhaps the flywheel is loose?

Thanks for your time.

Kym

EBXR

Is it straight gas or setup for dual fuel?

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'67 Mustang V8 4sp... what fun to drive!

BLO GMH

my XF EFI has the same type of thing. can be in neutral at a stand still and increase the rpm and it seems to vibrate. i was told it was cause i have nolathane engine and trans mounts that there is not enough movement in the driveline therefore sending every other vibration through the car.

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- BLO GMH

-> 1987 XF Fairmont Ghia - Silver, 4.1 EFI, T5, LPG, Clive Cam, Megatork Valve Springs, Crow Pushrods, Crow Timing Gears, Pacemaker Headers, Hi Flow Cat, Mandrel Bent Exhaust, ESA Straight Through Muffler, Grey Velour Interior, Full Electrics, Trip Computer, MOMO Race Wheel, King Spring Super Lows, Monroe GT Gas Shocks, Nolathane Bushes, EL XR8 Rear Axle w/ 3.45 LSD, Snowflakes

halo_djk

I didn't know they did that model on gas only, but it is setup for duel fuel and at present refuses to run on petrol. We think the mechanic may have ballsed something up when he changed the engine, apparently the previous owner never used petrol or so we are told. The autogas was installed while the car had the previous engine.

We have had to change the starter as about 1/3 of the starter edge of the flywheel has been worn down because the previous starter was not throwing its pinion out far enough to full engage with the full width of the teeth.

I'm starting to wonder if the flywheel is loose, but would then wonder if the starter would even grab it because the flywheel would move away from the starter if it started to loosen.

Thanx for the reply.

EBXR

From memory, there was no factory gas setup in the XE's. Any workshop could convert, and they generally either run straight gas or dual fuel. I think it might be an idea to change mechanics, and find one that specialises in LPG setups.

How long after purchase did the engine start vibrating??

__________________
'67 Mustang V8 4sp... what fun to drive!

halo_djk

Its my mothers car, but it was smooth when we brought it 6 weeks ago, the vibration has been getting progressivly worse since then.

halo_djk

UPDATE!

On disconecting the T-Converter from the engine, the vibration is surely in the engine. Balencer (pully) seems fine and is not distorted. What within a engine could cause this harsh vibration?

Pik0

i had something like that in my BMW (1984 528i) couldnt figure it out for so long then i checked the spark plugs and one on the connectors was lose, pushed that in and it worked well from then on... Hope that helps.

halo_djk

Thankx man, but no luck on that one either, replaced both leads and plugs first off for good mesure. No change I'm afraid.

Thanks for the reply.
K