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850 / S70 & V70 '96-'99 / C70 '97-'05 General Forum for the 850 and P80-platform 70-series models |
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Loss of Power…until restartViews : 420 Replies : 2Users Viewing This Thread : |
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Nov 13th, 2018, 17:46 | #1 |
New Member
Last Online: Jan 8th, 2019 17:07
Join Date: Mar 2018
Location: North Vancouver
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Loss of Power…until restart
Hi All, I’ve been trying to work through difficulties with my 850 1996 10 valve non-turbo with 162K Km
This is my third 850 over the past ten years. The car has been trouble-free since purchase. The car continues to start well and idle. After driving for about 3 minutes it loses power, if I use the accelerator it still has no power and may have small pops of backfire. If I pull over and shut the car completely off and immediately restart, good idle, the car has power again… but only for another 2-3 minutes of driving, this process continues to repeat itself over and over🤬. Over the past two weeks, I have patiently carried out the following: Made smoker and tested vacuum system for leaks - ok Can’t get OBD II readers to diagnose car(“won’t connect”)- made a LED circuit to probe OBD port, got codes 5-1-2 (short term fuel mixture too rich) and 2-2-3 non-functioning idle aircontrol valve (doubtful cause - but found good used valve) Replaced cam position sensor (suggestion after taking car to dealer) Replaced throttle position sensor Cleaned throttle body Installed new pre-cat oxygen sensor Tested Map sensor (vacuum plus multimeter) Tested IAT sensor (multimeter) Checked spark plugs - ok Replaced rotor and distributor cap Installed new fuel filter Tested fuel pressure at injector rail (45psi) Replaced fuel pump relay I’d be so appreciative of any suggestions, I’m running out of ideas. |
Nov 13th, 2018, 18:43 | #2 | |
Premier Member
Last Online: Yesterday 13:48
Join Date: Dec 2002
Location: Co. Limerick, Ireland
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Quote:
...which leads me to think your Engine Coolant Temperature Sensor is failing and, once the automatic choke function is disabled by the ECU after a few minutes, the sensor is telling the ECU that the engine is still cold so it starts the automatic choke process again resulting in over fulling.
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Liam... '96 854 TDI SE, '99 V70 2.5D S, '05 C70 2.0T Collection, '05 S80 2.0T SE, '15 V70 D4 SE Lux Nav. |
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Nov 14th, 2018, 11:45 | #3 |
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Last Online: Jan 8th, 2019 17:07
Join Date: Mar 2018
Location: North Vancouver
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Thank you for your advice Liam. I’ll try to locate a sensor this morning
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