Hello can anyone help , my 16v is over fuelling. what happens when the WUR Becomes faulty does this cause the K-jet to over fuel and flood the engine.
I'd have thought it's less likely to be the WUR than a temp sender, a sticky metering flap, or something like that. What's it like to start / drive? Does it change when it warms up?
Fuel pressure fine, Metering flap is fine too. Didn't get change to drive it off the drive. its started fine twice but then stailed when the revs dropped and when i took plugs out it was well and truly flooded fitted 260 cams though so thought its was the control pressure that needs reducing due to the longer duration.
ISV - temperature sensor on head (green / red cable on a 9A) ? Once started will it rev up OK, not being left to idle ?
Yes reved ok , sounded very good with the cams. just once staled that was it ! flooded Fuel pressure from pump to metering head 80 psi. will it the the return pressure from the WUR that needs to be 25psi ?
I assume the problem is cold starting, you`re running the KJet ISV and it`s OK ? I`ve had a previous problem (Mk2 9A KJet) whereby the temp sensor wiring to the ISV control unit was broken ... would start and drive OK but not idle. My Mk1 9A KJet (290 cams) runs without any of the idle / overrun electrics, will not idle from cold so is run `on the throttle` for a few minutes - once slightly warm idles OK. Don`t know reqd fuel pressures.
Hi Thank you so much for this. I thought only the ecu had a temperature sensor. Now, is this the one at the back of the head facing the firewall ?
When you say fuel pressure is okay, what is: 1. System pressure (I think you've measured this above, as 80psi) 2. Cold control pressure 3. Approx temperature you took the cold control pressure (ie ambient temp, around 15-20 deg C this time of year?) 4. Warm control pressure The last 3 parameters, are the ones you'd judge if the WUR was faulty, upon.
Oil temp rear nearside cyl head - green / black There are three water temp sensors on cyl head, below dizzy: Blue / white - ECU Green / red - ISV control unit Red / Yellow ... IIRC ? - dashboard gauge
I thought control pressure was supposed to be around 48 psi? There's an FAQ on it. 25 sounds very low.
Control pressure is low at low temperature and rises with higher temperatures, its quite a marked rise which is why you need to also take into account the "cold" temperature - a reading in winter (5 deg C for example) is sufficiently different to a summertime one (say 20 deg C) to be significant. There is a graph which plots pressure against temperature and a band of values which show the WUR in spec. See figure 3.40 in the Haynes manual, for the graph.
