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3.9 pinging

Tech Talk for Rover owners.

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3.9 pinging

Post by shakes »

In a mates county he's got a late 3.9 with early hi-comp heads all with holden 5ltr EFI gear and an ACE computer... (thats all we know about the motor other than the fact it fly's)

Its recently started pinging on petrol and LPG 4000rpm+ on LPG and 2k+ on petrol. With a noticable loss in power, and it has been running fine for quite awhile.

we've checked all the obvious, leads, plugs, cap, rotor, coil, replaced quite a few vacuum hoses and the Throttle Body and accellerator cables seem to be fine to... what else could be causing it?


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Simon
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Re: 3.9 pinging

Post by aliread »

shakes wrote:In a mates county he's got a late 3.9 with early hi-comp heads all with holden 5ltr EFI gear and an ACE computer... (thats all we know about the motor other than the fact it fly's)

Its recently started pinging on petrol and LPG 4000rpm+ on LPG and 2k+ on petrol. With a noticable loss in power, and it has been running fine for quite awhile.

we've checked all the obvious, leads, plugs, cap, rotor, coil, replaced quite a few vacuum hoses and the Throttle Body and accellerator cables seem to be fine to... what else could be causing it?


Cheers
Simon
stupid question but bare with me.
Have you checked the air filters
AKA Reads90

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Post by shakes »

yep, changed oils and a flush of the petrol tank and 95ron didnt help either
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Post by RaginRover »

Balance slipped and someone has played with the timing ?

Tom
"It was just an ordinary day, and you saw them. There were guys in their Porsches, "Look at me in my Porsche, ha ha!" and they were overtaken by a van. Driven by a girl!"
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Post by shakes »

Balance slipped??

someone has played with the timing -> not that we know of. not playing with it till we can suss out that its defintly the igntn timing.

Simon
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Post by 6.5 rangie »

Sounds like timing to me, just move the dizzy left or right and see if it comes good. Timing mark on balancer can slip.
Damien


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Post by Maggot4x4 »

Broken key on the crank?
[quote="Wooders"]If ya want a 4x4 camry go ahead & buy a Patrol or Cruiser.[/quote]Rangie with 80s LC diffs, Isuzu 4bd1, Twin ARB lockers, 8000lb Hi mount warn, 315x75x16 Procomp XTerrains
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Post by justinC »

Check max advance, should stop advancing at 3800, and with hi comp needs to be no more than about 25 degrees.

JC
'92 Rangie Sherwood/turbo intercooled isuzu4BD1 /ACE/ full leather/2.5" exh/2.5" body lift/DeCarbon shocks/LR tanks/LT95 back in and OK now, Sals conversion soon...
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Post by shakes »

your a wealth of good info JC we're gunna have to shout ya a beer when we do a tassie trip sometime next year.

the - to the coil had semi worn through and wasnt getting a strong signal.

all seems to be running good now.

thanks

Simon
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Post by justinC »

Definately like to catch up, PM when you have dates!
Have some good tracks and scenery down south.

I'll be away May to end of June at this stage, Doing the spectator thing at the OBC, And heading off up to the Kimbereleys after.

A good Red; Pinot or Cab Sav will be more than adequate thanks.

JC
'92 Rangie Sherwood/turbo intercooled isuzu4BD1 /ACE/ full leather/2.5" exh/2.5" body lift/DeCarbon shocks/LR tanks/LT95 back in and OK now, Sals conversion soon...
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Post by shakes »

also found quite a large crack around the exhaust at the muffler, welded this up and its a million dollars now.

Simon
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