Reply With QuoteDoes it run a high idle?.Mine did a similar thing and it was the stepper valve on the plenum. Pat
Wizard
I have a slight surge in my 3.9V8i on gas. Ihave changed my converter and had mixtures checked. It is still surging and only seems to be on gas at cruising speeds from 40-80 kms approx. What is the next thing to look at?. any info would be appreciated.
OldBushie
Does it run a high idle?.Mine did a similar thing and it was the stepper valve on the plenum. Pat
Wizard
I have had the stepper disconnected up until i put the converter on. Maybe i will try and disconnect it again but the idle has been ok just a little slow to come down when stopped at lights.Thanks will report backOriginally Posted by PAT303
OldBushie
Mines was the same.Stop at the lights and it took a second or two for the idle to settle. Pat
Wizard
Disconnected stepper again but the surge is still there?.
Wizard
I think this may be a electrical problem now. Tested the leads with an ohm meter and they varied from 2.6 to 3.5. Since i have had the vehicle(3 yrs) i am on the 4th cap and rotor(this last one original). The plugs and leads are only 6 mths old. I cleaned the metal points inside the cap they were a little black and i cleaned the rotor button. I will throw a set of plugs and leeds at it and see if it fixes it. Otherwise a new cap and rotor unless someone can steer me in the right direction. The coil is putting out a fair bit of spark but i don't know if it is the correct coil. Which coil should i have on it, The one on it now has no readible numbers ect. On the clamp it says Lucas but can't read the numbers.
Any help would be highly appreciated.
Thanks Brett
Wizard
O.K i have replaced the cap rotor leads plugs coil and redid the mixtures. Still have a surge so take it to my local mechanic we are driving along and asks when the snorkel went on. He turned the snorkel head around and the surge stopped turned it to the front again surge returned so point it backwards and all is good(Gee do i feel bloody stupid). I will look for a more permanent fix but at least i know the problem now.
Wizard
I have now put a balance pipe from the converter to the dirty side of the air box. It has levelled it out but i would expect to still get some surge on a windy day. still it is better than filling the air box up with muddie water.
Bit of a cluey mechanic you have got there
so what's the theory behind that ... Obviously its getting more air pressure .. but what is it effecting??
Is it affecting the MAF??
Mike
Fossicker
Yes gas is an amazing system, I don't know a lot about it. I used to work as a taxi mechanic and one of my cars ran on gas, a ford xf wagon. I learnt over my time that a gas system can be tuned one day a stuffed the next! I wish I could quote the terms, but its been a while. most gas systems are set to run rich, so you don't come back every day and complain when the weather changes, beause a convertor is a regulator and reiles on atmospheric pressure to operate correctly. I found I could get amazing ks to the tank by adjusting the mixture and reaction screws to the conditons of the day. This should be easy to do with just your fingers if you convertor is easy to get to. Storms= low pressure, nice day most likely=high. I strongly suggest that you do some reaserch on your convertor, theres a few types, and learn to adjust it yourself. You can't run lean on gas, it just won't go, or will have no power. So there is nothing stopping one from playing with the system. But you can run rich. Once you master the settings on your convertor, you won't need to see a mechanic again, and you will save on gas, you will spend a little more time under the bonnet as the weather changes. Disconnect that balance hose and see what happens.
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