Volvo 340,loss power on climbs

It's a Volo 340 with B172 engine (renault engine). Work well, except ascenting where power almost disappears. Spark plugs are new. Solex Z10 looks without adjustment. I hear soft metalic noise on cylinder head when high power (perhaps, drive valves, but could be normal). More, par gap/power gap looks very narow (2800-3300 rpms). Under 2800rpm don't go up at least overload.

On slopes, with top acelerator pedal, motor firecracker.

Furtermore, user's manual refences a deceleration's mechanism and tachometer's relay... what is it?, Where is it?

Thanks.

Reply to
C.M.F.
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A backfire under full power probably something fairly significant. Means petrol is being burnt in the manifold or when the exhaust valves are open. Possibly - cam belt has slipped.

Or a combination of something affecting the low end (like ignition) and high end revs (fuel or air problems).

I think this is referring to the fuel cut-off under deceleration, but I wasn't aware 1.7s had this, more common in injections systems. Also UK 340s didn't have tacho, and on 360s it simply feeds of the coils low voltage side. Possibly both these things are referring to 1.4 automatics.

Sounds like the Engine is in a bit of a mess, this is the kind of reason I avoid 1.7s.

Does it tick over ok?

-- Tony Stanley ++Always Learning++

Reply to
Tony Stanley

any use

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Reply to
Mad Sad Dad

I would guess that your ignition timing is out of adjustment.

"Metalic noise on cylinder head when high power" could be detonation (sometimes called 'pinking', 'pinging', or 'knocking'); "motor firecracker" is presumably backfiring.

Both of these things can be caused by faulty ignition timing.

Reply to
Stewart Hargrav

"Tony Stanley" escribió en el mensaje news:bqcvfe$f38$1$ snipped-for-privacy@news.demon.co.uk...

ok!, but carb have 2 electric dispositives to same electric cable. One for tick over (electrovalve) and other is in base carb for.......

I have this car 3 weeks ago. At first, base carb junction was broken. I don't know how long was it (previous owner), but mainfold had a crust on all surface (difficult clean). I clean it and change the junction. And now ticks over very well. Perhaps exhaust valves don't close due to that crust or damage by crust. I think doesn't air leakage intake now. Backfire is on slopes without pedal press.

Can ignition timing adjust in this engine?, if only is that.........

Regards

Reply to
C.M.F.

No, the ignition time is not adjustable directly. But if the timing is out it is caused by other problems like a slipped timing belt (ie its not on the right teeth).

I think if the valves didn't close you wouldn't get much compression and it would be difficult to start.

Exhaust leaks / broken exhausts can cause light back fires on deceleration.

-- Tony Stanley ++Always Learning++

Reply to
Tony Stanley

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