focus_joe

hi guys just bought a xr3i the problem I can't get to the bottom of is when you first start it it will cut out and then start again and so on for 5 mins until walms up and misfires until at normal temperature (I think as temp gauge also doesn't work but changed the sensor?)

im stumped, pulled cold start injector out and that squirts when you turn the key changed plugs and fuel filter. Before I bought it the previous owner said it would boil over but he changed thermostat and has not since. The gauge and fan does not kick in so not sure what temp it's running but it does not boil over now.

Any ideas guys? Cars going into paint next week and hoping to get engine fault sorted to get mot and ready for summer

stevo123

Hi. I just posted a reply but it did not work.

Try the WUR (Warm up regulator). They regulate fuel pressure during warm up cycle. Disconnect electric plug from cold start valve - not needed in our climate really.
Some K-Jet cars, I think VW, have an adjustable WUR and may well work with the XR. Have a google on them and see if it's failure matches your symptoms.
Maybe try a known working replacement first as fault finding?
Steve

focus_joe

Thanks for your reply, were is the WUR located ?

regarfs
joe

stevo123

It's in front of the throttle body but behind the rocker cover. 2 red pipes and one electrical connection.

haz87

Just check the fuel pressure at cold through to hot. Will soon tell you what the WUR is doing. Golf GTI 16v/Capri/many other WURS can be modified to be adjustable as mentioned - always a good mod.

focus_joe

Sorry for the dumb questions I'm a carb man myself

what's the procedure to check the wur pressure ?

focus_joe

how is it adjusted on the xr3i I don't see any adjusting screws or anything unable to test

haz87

System pressure can be adjusted via shims. The design of the WUR means Control pressure is not adjustable easily - however not impossible! The how-to is fairly long tho - have you confirmed you need to be adjusting pressure yet?

focus_joe

No not yet, still need to check pressure but unsure how to go about testing it

regards

haz87

Ignore the WUR adjustment (as thats a 16v Golf WUR - xr3i uses the same WUR as an 8v Golf) but it shows you how to set up the pressure test at least