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  #1  
Old May 29th, 2015, 08:42 PM
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Stumbling issue

Went out and cranked the 90 up this afternoon. Idles fine, but when I initially give it gas it stumbles then as rpm climb it's smooth. Only does it on initial press of gas.
Let it run for 20 min, issue stayed.
Haven't driven it in 2 weeks, and only thing I've done recently (yesterday) was spray PB blaster on the studs of my Y pipe. I mean I really laid it on and could have shot some from underneath into something else accidentally.
Other than that I have no idea. Help!
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1994 Defender 90
2006 LR3 SE
1996 Discovery I (sold)
1991 Range Rover Classic (sold)
1995 Range Rover Classic (sold)
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  #2  
Old May 29th, 2015, 09:10 PM
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Just went out and cranked it again after checking all my plugs, and it didn't do it, not once.
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1994 Defender 90
2006 LR3 SE
1996 Discovery I (sold)
1991 Range Rover Classic (sold)
1995 Range Rover Classic (sold)
2006 LR3 SE (sold)
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  #3  
Old May 29th, 2015, 09:15 PM
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Y pipe? like the exhaust... not likely.

Temporary stumbles:
Water in the line/tank/intake
Water on the electrics (coil packs/plug wires in particular)
leak back (fuel not getting to the injectors because they're not fully closing or other fuel part is allowing fuel to return to the tank.
water or other contaminate in the vacuum system. (not familiar with that engine, but given its age, I imagine it's a spaghetti mess of vacuum lines as many cars were when trying to make engines meet new emissions standards around 1992).

I had an early bosch EFI bug that would do that after sitting for a few days-weeks. replaced some fuel lines, pump and injectors and it stopped.
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Old May 29th, 2015, 09:47 PM
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I wasn't saying it was the Y pipe, I was saying that I sprayed the hell out of PB Blaster on the studs yesterday and think I got some up around the plugs. I cranked up again moments ago and no issues. Must have got some of that mess in a plug and it dried out.
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1994 Defender 90
2006 LR3 SE
1996 Discovery I (sold)
1991 Range Rover Classic (sold)
1995 Range Rover Classic (sold)
2006 LR3 SE (sold)
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  #5  
Old May 29th, 2015, 10:37 PM
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So... Y pipe isn't an exhaust thing? I meant ... In all but maybe front exhausting transverse cars, there is no way to get from the y pipe to the spark plugs. Pb blaster probably wasn't then culprit.
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