Gremlins have struck

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Gremlins have struck

Post by eddie0303 on Mon Aug 26, 2013 6:45 pm

Well as I mentioned in another post I cured the overheating problem on my van ,just after purchase and have been carrying out work to get it through the MOT for the past couple of weeks on and off . The van started fine after I cured the overheating and while I was doing some work today I thought I better get some power in to the battery .

Well she needed a bit of a boost from the charger first but started up fine for a couple of minutes although the revs were racing at about 2000 rpm , then the revs dropped and the van started to surge on tick over and the brake warning light was also on . It was running fine after I refitted the inlet manifold gasket and now its like a bag of bolts .


The engine still does not over heat but the electric fan did not cut in as it got warmer and the water level is fine , There is no bubbling in the header tank and although there is a slight amount of water from the exhaust when first started it soon stops and there is no sign of any steam . So I a baffled , I had a look for any lose vacuum pipes and cannot see anything so I am baffled .


Has any of the more experienced Jet owners got any ideas please .


Many thanks

Eddie
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Re: Gremlins have struck

Post by rich the mechanic on Mon Aug 26, 2013 7:37 pm

Have you refitted the stat? and have you topped the water up since the refill and warm up cool down as they never fully fill up and need a run and top up to get the last of the little bits of air out of the traps, the surging usually is a bit like hunting as the air passes the water pump (reducing engine load) and the cold idle sensor.
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Re: Gremlins have struck

Post by eddie0303 on Mon Aug 26, 2013 8:01 pm

Hi Rich , thanks for the response , I have not been able to run it as its got no MOT or tax at the moment , but the water level is fine and has not dropped since I last checked it so I am stumped at the moment. When I first fitted the gasket it was smooth on tickover and has only just started this problem , and as mentioned the brake warning light is now also on in the dash . Sods law I suppose , Sad ,

Cheers

Eddie
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Re: Gremlins have struck

Post by HighlyJetted on Mon Aug 26, 2013 8:06 pm

Brake warning light just detects the fluid height in the res.

If the fluid is low, either your pads are on the bone, or you have a leak.
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Re: Gremlins have struck

Post by eddie0303 on Mon Aug 26, 2013 8:19 pm

Hi Matt, No sign of brake fluid leakage and the pads are not bad , as I checked them out when undersealing , also fluid is spot on , so ? who knows Crying or Very sad , need to get the problems sorted before the weekend as well as finish off the pre MOT bits .

O well , soldier on

Cheers mate

Eddie
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Re: Gremlins have struck

Post by HighlyJetted on Mon Aug 26, 2013 8:21 pm

Take the fluid float out and see if the magnet is still in the middle.
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Re: Gremlins have struck

Post by eddie0303 on Mon Aug 26, 2013 8:25 pm

I will give that a try tomorrow , thanks Matt . Have you any ideas on the other problem of the surging revs ?

Cheers

Eddie
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Re: Gremlins have struck

Post by HighlyJetted on Mon Aug 26, 2013 8:33 pm

Revs going up and down at idle is what I call hunting.

It is cause due to the idle control valve not having hot coolant running through it.

What the valve does is it increases the engine idle speed when the coolant is cold.... when the coolant gets hot, the valve contains some wax which melts and expands forcing a valve to close which brings the idle speed down once warm.

What happens if this valve is not getting coolant flow is - the engine gets warm so it idles better, but because the cold start fast idle is open it revs too high. When the idle revs hits about 1500rpm the ECU cuts the fueling to try and make it idle. Then the engine dies off to about 700rpm, but straight away climbs back up to 1500rpm, where it cuts again and goes round it this loop.

The ecu has a target idle programmed in it, its what makes the vehicle idle so nicely all year at any temperature or pressure. When the fast idle valve is stuck open due to the coolant flow , the ecu cannot meet the target idle point.

Fast idle valve is part of the throttle body mechanism, its bolted on the side, and it has two coolant pipes - a feed and a return. Pipes could be blocked, or its air locked.
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Re: Gremlins have struck

Post by eddie0303 on Mon Aug 26, 2013 9:05 pm

If the pipes were put back in the wrong order ie flow into the return would could that be the problem or is it more likely to be an air lock ? .

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Eddie
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Re: Gremlins have struck

Post by HighlyJetted on Mon Aug 26, 2013 9:24 pm

Doesn't matter which way the pipes go, probably wouldn't reach the wrong way anyway.

Part of my bleeding method is to undo one of the idle control valve pipes and purge a load of water though it. Tend to undo the pipe off the cylinder head, put my finger over one end and purge, then put my finger over the other bit then purge.
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Re: Gremlins have struck

Post by eddie0303 on Mon Aug 26, 2013 9:32 pm

Thanks for the tips Matt I will try and sort it out tomorrow , will let you know what happens .

Many thanks

Eddie
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