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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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Help!?Views : 1562 Replies : 29Users Viewing This Thread : |
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Oct 9th, 2020, 22:08 | #1 |
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Help!?
Hey peeps hope someone can help me .
If I disconnected my battery my 940 turbo will idle with good afrs for a few minutes then start to lean out to around 20 on my afr gauge. Driving the car is fine and afrs seem normal . Car idles fine too apart from the lean afr reading .? It is a modded 940 turbo with to blue injectors and 16t turbo etc etc Also noticed that a ballast resistor thing is getting very hot is this normal ? I think its a pre injection ballast or something? I've already done the resistor mod for the injectors But this is another one ? Any help be much appreciated |
Oct 9th, 2020, 22:23 | #2 | |
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Quote:
The second resistor is probably for your dim-dip so will get hot, that's why it's aluminium clad to disperse the heat.
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Oct 9th, 2020, 22:34 | #3 |
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Leaning
Cheers for reply . I know it needs to re learn .
When I Google the part number it says its a fuel injection pre resistor? Should idle around 14.7 on afr gauge which it does for a bit if I disconnect battery . Just seems like once car becomes to get warm ot messes up and leans out . If I leave battery connected it just idles lean all the time .?? Only when I discon Its fine for few mins and you can see the afr gauge lean right out in instant and stay there ? |
Oct 10th, 2020, 00:09 | #4 |
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You need to monitor the lambda sensor and see what it is doing
What is it leaning out to on your AFR gauge? |
Oct 10th, 2020, 01:12 | #5 | |
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Quote:
Yes, 14.7:1 is stoichiometric, lower is rich, higher is lean but as Dai pointed out, you need to monitor the Lambda sensor. The output of that should swing from a smidge over 0.00V to a smidge under 0.99V with stoichiometric equating to ~0.45V. Where is your wideband sensor for the AFR meter located? Also, just to be clear, you're not disconnecting the battery with the engine running are you? Also is it a known good battery? Is the engine cold, warm or hot during these tests you're carrying out?
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Oct 11th, 2020, 20:29 | #6 |
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Leaning
Hi it seems to always idle around 20 on afr gauge.
Will cruise at 14.7 and 10/11 ish at wot. So driving it seems fine its why its leaning on idle.? Just to be clear if I disconnected the battery so it resets itself when I reconnect and start the car it will have good idle afrs until it warms up a bit then goes straight to 19/20. And from that point there after will always have chappy idle afrs. Just can't work out why . The resistor/ ballast thing I'm talking about sits on the passenger wing with the rsr and power stage thing. And when I Google the part number it says its a pre injection ballast resistor? But that part gets really hot after 5 mins of ignition on or engine running and my mates identical car with same mods doesn't? Any help be appreciated. Also has a brand new bosch lambda sensor with genuine plug . |
Oct 11th, 2020, 22:07 | #7 |
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Check your fuel pressure at idle. Also if the resistor mod is what i think it was, bypassing the resistor so you can run high resistance injectors then there shouldn't be any current flowing in it and therefore no heat.
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Oct 12th, 2020, 00:11 | #8 |
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Leaning
Yeah thanks I will check the fuel pressure.
In the same position on the wing there are 2 Ballast resistor things 1 which had 4 in it which I've removed for the injector mod and another with 2 in it which is the one getting hot and don't know what its for? |
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Oct 12th, 2020, 10:51 | #9 | |
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Quote:
What is the Bosch part number on your injectors?
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Oct 12th, 2020, 11:41 | #10 |
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At your service....
7/46: Dim/dip resistor 20/15: Injector ballast resistors |
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