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Loss of Power…until restart

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Old Nov 13th, 2018, 18:46   #1
Cammer
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Default 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.
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Old Nov 13th, 2018, 19:43   #2
Baffler
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Quote:
Originally Posted by Cammer View Post
if I use the accelerator it still has no power and may have small pops of backfire.
Backfire will occur due to unburnt fuel in the exhaust...

Quote:
Originally Posted by Cammer View Post
got codes 5-1-2 (short term fuel mixture too rich)
...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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'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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Old Nov 14th, 2018, 12:45   #3
Cammer
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Thank you for your advice Liam. I’ll try to locate a sensor this morning
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