dauer
New member
- Joined
- Jun 13, 2012
- Location
- Asheville, NC
Hi Folks.
As the title states, I experienced some intermittent power loss while driving yesterday morning then when I got in my car to head to lunch it would crank but not start. It tried to start a couple times but now, nothing. Prior to this my car's idle speed would occasionally/randomly increase to approximately 1500 rpm, if I turned it off then restarted the idle speed would return to normal (about 750-800 rpm). It has been exhibiting this symptom for a while.
Here's what I've confirmed or replaced thus far: noise suppression relay, fuel pump relay, crank position sensor, cap and rotor, cleaned IAC valve and MAF, confirmed it has spark, confirmed it has fuel by pulling fuel supply line and cranking (a healthy stream of fuel flowed), spark plugs are perfect, confirmed injectors and IAC are working via control function 3 in green Volvo LH2.4 book. It will fire up on starter fluid but won't remain running.
That leads me to control function 2 in the green book which tests the TPS. I can only get the diode to flash the 3-3-2 sequence no matter if the throttle is open or closed, although it always returns to rapid flashing which signifies an error code. I did confirm the TPS "clicks" when the throttle is opened and I checked the resistance at the TPS using info from a different message board (the horror!) and it yielded inconsistent/incorrect results.
I'm not very experienced in trouble shooting ignition/fuel problems but based on my findings I'm leaning towards the culprit being a faulty TPS. My questions are as follows: Does my assumption seem logical? Should I test anything else? Is it typical for a faulty TPS to cause a "no start" condition? Thanks.
As the title states, I experienced some intermittent power loss while driving yesterday morning then when I got in my car to head to lunch it would crank but not start. It tried to start a couple times but now, nothing. Prior to this my car's idle speed would occasionally/randomly increase to approximately 1500 rpm, if I turned it off then restarted the idle speed would return to normal (about 750-800 rpm). It has been exhibiting this symptom for a while.
Here's what I've confirmed or replaced thus far: noise suppression relay, fuel pump relay, crank position sensor, cap and rotor, cleaned IAC valve and MAF, confirmed it has spark, confirmed it has fuel by pulling fuel supply line and cranking (a healthy stream of fuel flowed), spark plugs are perfect, confirmed injectors and IAC are working via control function 3 in green Volvo LH2.4 book. It will fire up on starter fluid but won't remain running.
That leads me to control function 2 in the green book which tests the TPS. I can only get the diode to flash the 3-3-2 sequence no matter if the throttle is open or closed, although it always returns to rapid flashing which signifies an error code. I did confirm the TPS "clicks" when the throttle is opened and I checked the resistance at the TPS using info from a different message board (the horror!) and it yielded inconsistent/incorrect results.
I'm not very experienced in trouble shooting ignition/fuel problems but based on my findings I'm leaning towards the culprit being a faulty TPS. My questions are as follows: Does my assumption seem logical? Should I test anything else? Is it typical for a faulty TPS to cause a "no start" condition? Thanks.