V8 power loss

[Hendri Downing]

Hi,

 

Friend of mine owns a defender 3.5 V8 with SU carbs – problem he is having is that that it has no power.   Starts easily, runs perfectly when not in gear and revs freely.  He replaced all the HT leads, and when you pull the fuel line off there is fuel coming from the pump.  Any suggestions on what to check.

 

Thanks

Hendri

[Mike Ilsley]

Hi Henry.
The easy things are timing and air filter, but a compression test may be required. Some of the older 3.5s had a tendency to wear the camshaft lobes off, also resulting in a drop in power.

Good luck
Mike

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From: lroc-te...@googlegroups.com <lroc-te...@googlegroups.com>
To: lroc-te...@googlegroups.com <lroc-te...@googlegroups.com>
Sent: Wed Dec 28 07:13:06 2011
Subject: [LROC Techtorque] V8 power loss

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[Hendri Downing]

Hi,

 

Problem seems intermittent (important info I left out).  No smoke, actually runs perfect but without power at times .  I could only think fuel problem (carb or fuel pressure) or that little electronic ignition thingy on the dizzy?  

 

Thanks

[JANSEN VAN RENSBURG, HANNES [AG/6216]]

Hi Hendri,
There is a few things to look out for.
Ignition timing?
Distributor centrifugal advance?
Distributor vacuum?
Otherwise, did he check the fuel filter? It can also be the the piston damper that needs lubrication or a sticking piston in one of the carbs.
Rwgards
Hannes
Hannes J Rensburg

 

From: Hendri Downing [mailto:hendr...@vodamail.co.za]
Sent: Tuesday, December 27, 2011 11:13 PM
To: lroc-te...@googlegroups.com <lroc-te...@googlegroups.com>
Subject: [LROC Techtorque] V8 power loss
 

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[Philip Lochner]

Yes, check the easy/cheap things first:

1) Check that centrifugal advance operates freely (it should be possible to rotate the rotor quite smoothly by hand clockwise about 10-20 degrees and it should jump back under spring load by itself)

2) vacuum advance has nothing to do with power but does play a major role towards fuel economy (suck on the pipe going to the vacuum advance, it should hold vacuum).  Check that its mounted properly though.  I have had cases where the vacuum advance unit was loose and this changed timing at will. 

3) coils and ignition modules can be intermittent although rare and are often heat related.  A coil is not just a coil!!  Be sure to get the exact correct coil (or equivalent) that should be in that car, if you decide to change it.  HT leads could also be intermittent and throw spark away (more so when hot);

4) Cams and lifters can be worn (due to oils being used with insufficient quantities of ZDDP).  Since this problem is intermittent we can assume its not cam/lifter related;

5) Carbs could be at fault but again being intermittent, unlikely.

 

Let us know if you find anything?

 

Best regards

Philip

-----Original Message-----
From: lroc-te...@googlegroups.com [mailto:lroc-te...@googlegroups.com] On Behalf Of Hendri Downing
Sent: 28 December 2011 07:13 AM
To: lroc-te...@googlegroups.com
Subject: [LROC Techtorque] V8 power loss

--

[Andre Oberholster]

Hi Hendri, an ignition problem normally causes a miss and most likely the engine would just cut out. However, cracks in a dissy cap, a worn cap/rotor (hard starting) or a loose dissy base plate could throw you around.

A power loss normally indicates – as you suspect – a fuel problem. I have had this numerous times on both the diaphragm type pump or the impeller (small cylinder) type. Pulling off the fuel pipe still shows a good stream of fuel but the pressure is low.

Fuel starvation could also be caused by a low float level or needle and seat issues (sticky needle). The carb pistons could also be sticky due to gunk on the carb dome walls.

My guess would be fuel pump – it is OK when cold, and then tends to get lazy after a while as it gets hot. There is no fixed pattern and lets one think it is intermittent.

Rgds, Andre O.

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[Andre Oberholster]

Ummm – something that caught me out once and I battled for days – I found a spark plug with a piece of dislodged carbon across the electrodes...

So check the plugs. I also found a brand new set of HT leads (pirate parts) to be defective (notorious on the 3.5 Rover) – leading me around the bush for weeks.

In both above cases the engine ran smoothly and revved well – but lost power under load – WITHOUT seeming to miss.

Andre.

[Mike N]

Henri, this would mean a process of elimination.

I had a power loss problem in my '89 V8 when the fuel pump in the tank
started going south. Schlepp to pull the tank, but the actual problem
was found to be the little nylon sieve at the foot of the pump, it was
nearly fully blocked after 19 years, the pump simply battled to suck
sufficient fuel through, the float bowls could just not be kept full
and the mixture leaned out, with the power tapering off. Started off
only at full power and steadily regressed from there over a period
(changing the fuel filter initially helped but eventually also did not
help any more), where it got to the point that climbing a long hill
foot flat in third and fourth would cause full starvation, but rapid
recovery of running quality on idle, casual revving, and light work. I
changed the internal pump and sieve for an external Huco pump with an
external inline filter on the suction side, problem resolved, and I do
not have to pull the tank again for pump problems :-).

Slipped timing could also have a big influence, but would usually not
lead to intermittent power loss.

Then I also had an intermittend power problem when the original coil
started giving up, but that was more a misfire (jerky) type problem,
not a smooth power loss as the fuel problem.

And at another time I had a plug wire which were handled a bit rough,
it broke inside the plug cap but was still sparking over inside the
cap, unless there was a bit of moisture around, then it would track
outside and the misfire would start. Took me a while to find that one.


On Dec 28, 8:46 am, "Hendri Downing" <hendri....@vodamail.co.za>
wrote:

[Gys Vermeulen]

Hi Hendri
You made me think long time ago - I had a Dodge Avenger- being a poor student I had to do the services myself. One morning it also started well but could not rev at all. In the end found the rubber flange(?) in the stromberg carb to be perished and letting all the vacuum through. Being a poor student I could not afford the new rubber for about R11-00 rand and solved my problem with patch and solution (50c). The patch and solution was kept in my cubi-hole(?) should the problem occur again - sold the car many moons later still with the patched flange.

With the V8 I replaced the electronic ignition and reinstalled the old points and condenser system. Always kept a spare set ready if they played up.

Groetnis
Gys

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[epe...@camdekon.co.za]

Hi all my 300 tdi does not want to start. It is getting fuel to the filter outlet but does not seem to have flow at the injector pipe . Any ideas. Rergards errol


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[Philip Lochner]

Jy tuis vanaand?  Ek wil jou kom wys wat ek met Alex Greyling se oranje monster gedoen het.

 

 

 

Best regards

Philip

[Dave Morgan]

Check that the wire to the solenoid on the injector pump hasn't come
loose/disconnected! Sounds like it has!

Regards, Dave

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[Peter Levey]

Yes, that's the lead you had to disconnect when it wasn't stopping a month or so back :-)
Peter Levey
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[epe...@camdekon.co.za]

Yea I know, this time the solinoid was getting power but not activating. Towed the vehicle home and fitted a new solinoid. She starts!! Bad news is lots of metal swarf in the recess
. Not good news I think. Rebuild due I suppose. Thanks for the replies.

[Peter Levey]

Glad it's sorted out

Regards
Peter Levey

[Hendri Downing]

Hi,

 

The problem was solved – the fuel pump was not delivering enough fuel due to blocked filters – we are stripping the tank as there seem to be lots of dirt inside so that this wont happen again soon.   Interesting thing is that this happened fairly suddenly – maybe just got to that critical point now?

 

Thanks for all the advise – this is what makes the LR community special. 

 

Went to have a look at the new Puma  - it now has a 2.2 diesel instead of the 2.4.  The sales staff really do not know much about their own product as they could not even tell me what engine it is – I am assuming its the ford Duratorque motor.  If so, why dont they use the 2.7 diesel (or is it 3.2???) 

 

Regards

 

Hendri

[Bertus Bekker]

It's all about European emission and tax legislation, Hendri (2.2l for emission and less than 2,5l for tax).

The 3.2 would be lovely - even though it is 5 cyl, the rad cowling is soooo long with the 4 cyl that  I'm sure a 5 cyl will fit (bonnet bulge might be too short). I do not know if the MT82 gearbox would be able to handle the 3.2's torque though - apparently a lot of Mustangs stripped them with their V8s. Have not been able to find out which 6 speed manual the Ranger uses.

Regards

[Jakob Jordaan]

Hendri,

The new 2.2 motor is a brand new LR design.  The latest LROI has the new changes fully covered.

Groete

Jakob Jordaan
082-808-1422

 

 

Best regards

Philip

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Directors:
T Daka (Chairperson)*, JP Ndhlovu*, Y Kwinana*, SP Mzimela*, MM Zwane (CEO)

*Non Executive

Company Secretary – Ruth Kibuuka
SAA Technical (Pty) Ltd               Reg. No. 1999/024058/07

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[dirk...@gmail.com]

Vanoggend uit Bergkwagga gery. Slaap vannaand in Bloem en dan more tuis.

Groete

Dirk

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From: "Philip Lochner" <phi...@gpltel.com>

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Date: Thu, 29 Dec 2011 14:34:11 +0200

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[Philip Lochner]

Sorry all. This was meant for Andre O. Lack of concentration on my part.

[Franscois Fitzgerald]

Dankie Dirk. Nou weet ons almal. Maar het vir my gelyk Philip het daai vraag  vir Andre gevra.

 

Julle moet mooi ry!!

 

From: lroc-te...@googlegroups.com [mailto:lroc-te...@googlegroups.com] On Behalf Of dirk...@gmail.com

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[Mike N]

Thanks for the feedback Henri, good to hear it was not something
serious.

On Dec 30 2011, 8:13 am, "Hendri Downing" <hendri....@vodamail.co.za>
wrote:

[Philip Lochner]

If anyone can help me with the above or know where I can get it, I'ld be most grateful! 

 

I stripped the cowl from my own Disco confident that this part should be easily replaceable from British 4x4, modified it, installed it into the RR/Thor conversion I did only to find out today that British4x4  can not help me...

 

I actually got the large bottom part, now its only small the top part with the two clips I need please.

TIA

Philip 

 

[Bertus Bekker]

Some of the classic Rangies had a similar cowl, Philip, although they were mostly single piece.

Perhaps Phillip Glyn can help you, else one of the other scrap yards.

Regards and have a good 2012

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