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S80 '98-'06 / S60 '00-'09 / V70 & XC70 '00-'07 General Forum for the P2-platform S60 / V70 / XC70 / S80 models |
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Throttle body cleaningViews : 1727 Replies : 17Users Viewing This Thread : |
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Mar 1st, 2019, 15:03 | #11 |
Aka MadBabs
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"Invalid link code"
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`03 V70 Mk2 Auto 2.4 B5244 NA, 170Bhp, 295K miles (Now parts donor) '05 XC70 MK2 Geartronic, 2.5 B5254T2, 210bhp, 129k miles |
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Mar 1st, 2019, 15:16 | #12 |
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Mar 1st, 2019, 15:48 | #13 |
Aka MadBabs
Last Online: Nov 11th, 2022 15:29
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Hmm..
Judging by graph, both potentiometers work(blue+green). And show the same thing. If one of them was worn, its reading would differ from the other. (This comes from my knowledge of electrics and electronics, not the throttle- I'm a sparky by trade) And yet the throttle doesn't seem to be closing all the way as it should. So maybe mechanical, after all? Bit of crud left on, or maybe even pushed in during cleaning, the hinge? At this stage I'd unplug the battery (so the ecu can reset whilst I work the cloth), remove that throttle and give it a proper one. A lil' bowl of petrol, paintbrush.. Wash it all out. That's what I'd do.
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`03 V70 Mk2 Auto 2.4 B5244 NA, 170Bhp, 295K miles (Now parts donor) '05 XC70 MK2 Geartronic, 2.5 B5254T2, 210bhp, 129k miles |
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Mar 1st, 2019, 15:59 | #14 |
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Thanks Thomas, that sounds like a sensible diagnosis.
The issue only started after I cleaned the ETM so would be quite logical that I somehow push dirt into somewhere it shouldn’t go while cleaning. So will clean it as suggested and report back. |
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Mar 1st, 2019, 19:55 | #15 |
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Ok so yours being a N/A means there are very little vacumn lines and air pipes compared to the turbo models. So very little chance of air leaks.
Do check that the intake pipe has no cracks or leaks in. Unplug the MAF sensor and try running it.
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Who said Volvos were build to last? 2.4t V70XC Auto 2001 165k D5 185 XC70 M66 2006 202k |
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Mar 1st, 2019, 21:11 | #16 | |
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Quote:
If so that seemed to be in good condition with no cracks. What am I testing by unplugging the MAF? |
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Mar 2nd, 2019, 08:12 | #17 |
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Not sure of differences between the P1[mine] and your car are,but when the throttle position sensor needed changing[mine is also on Magnetti Morelli] to contactless the idle reves would constantly "surge" would not rev past 4,000 and when easing off the throttle the whole car would "hunt" so different symptoms to what you're experiencing.I've always used carburettor cleaner for cleaning throttle bodies along with an old toothbrush and a soft lint free cloth.The reason for removing starter motor when removing throttle body is that the wiring for it runs between starter and engine block to a plug near bottom of radiator and there's not enough clearance between starter and engine to get the plug past.On mine there are two[from memory] bolts holding starter to bellhousing and a support bracket holding other end of starter to engine block.
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Jan 17th, 2022, 16:01 | #18 |
young and dumb
Last Online: Jul 8th, 2023 13:40
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Old thread I know, but I came across this while searching for the solution to the exact same problem and I've managed to solve it, at least for me and hoping I can at least guide someone. Symptoms were the same including a magneti marelli throttle that seemed to be healthy.
Started by cleaning the throttle body, as it was filthy and sticking open occasionally, so that helped a little but didn't solve it. What solved it for me was replacing the thermostat (and rad hoses but I doubt those did it). Noticed in the summer it would run slightly cool sometimes, but didn't think anything of it. As temperatures dropped in to winter the engine temp was getting lower and the heater was getting poorer so I decided it was time to replace the thermostat. This seemed to solve it, and even after a battery swap (which makes the throttle relearn its mappings), I had a few moments of funky idle as it learned its self, and it's been perfect since. Hope this helps someone.
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00 V70 Mk2 2.4 (140) Auto |
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