Reply With QuoteWhat's the theory.... that the manifold was drawing fuel vapour thus running rich, or it was drawing air and the ECU subsequently threw more fuel at it?
Master
SupporterHi,
Just thought I'd share the experience of finding and replacing a bad purge valve on the V8.
Symptoms were rough idle and rich running with hesitation on acceleration.
Eventually found the purge valve was not holding vacuum reliably. LR dealer wanted ~$300 and 3 week delivery time Local Hyundai parts have an identical Korean copy of the Bosch part for $130. It's a mid 90's Sonata part. Hyundai part on left, Bosch on right of the attached image.
All good now, apart from some sooted-up O2 sensors.
HTH
Steve
Master
What's the theory.... that the manifold was drawing fuel vapour thus running rich, or it was drawing air and the ECU subsequently threw more fuel at it?
Swaggie
SubscriberThe purge valve is in the carbon canister and controls the inlet of fuel vapour into the manifold.What's the theory.... that the manifold was drawing fuel vapour thus running rich
AFAIR it usually opens on small throttle openings while moving ie cruising so yes it would cause rich running on idle if open/leaking.
I recall the first 1980 5 series BMWs imported into OZ had a faulty system and every one stopped on a very hot day. The buyers were not pleased and it was a major recall.
Regards Philip A
Master
SupporterValve enters the inlet path after the MAF, so it is unmetered air. I presumed the O2 sensors would indicate a lean mixture, making the ECU lengthen injector times. But then it would have to over-compensate to make it carbon-up.
Steve
The MOD Father
First bad purge valve post,,,
"How long since you've visited The Good Oil?"
'93 V8 Rossi
'97 to '07. sold.
'01 V8 D2
'06 to 10. written off.
'03 4.6 V8 HSE D2a with Tornado ECM
'10 to '21
'16.5 RRS SDV8
'21 to Infinity and Beyond!
1988 Isuzu Bus. V10 15L NA Diesel
Home is where you park it..
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