98 s70 t5 stalls as soon as it warms up so 10 min or so

Steve99s70t5manual · Post by **Steve99s70t5manual** » 12 Jan 2018, 23:54

Ok I just bought a 98 s70 and the Ce light is on and the codes that come up are p0300,01 02,03,05 and the p0442 p0455 p0116. The coolant sensor was my first suspect but I changed it and it still stalls when it warms up. Now it runs beautiful from cold, like smooth idle and revs nice but I notice that the revs don't come down easy. Also once it has been running for 3min it starts to get the odd sputter and only gets worse until it totally stalls out. The guy I got the car from said a few times all the lights on the dash would flash and then the car stalls so if that helps please let me know. I also check the fuel pressure relay and it was ok. Any help at all would be great as I only have a 2day permit on the insurance and it is 40miles away from home at a gas station.

Post by **wizechatmgr** » 13 Jan 2018, 00:31

The P030x are multiple cylinder misfires - I'd ignore them at this point in time. P0442 & P0455 is EVAP/EMISSIONS - Large vac. leak I believe...

P0116 indicates you may have a faulty Engine Coolant Temp sensor or the circuit it is in. That would explain weirdness after hot though usually those have problems when the engine is cold... That's a cheap and relatively easy part to replace. I'd replace it first.

Link to troubleshooting values of one... viewtopic.php?t=52203

Steve99s70t5manual · Post by **Steve99s70t5manual** » 13 Jan 2018, 01:09

I already changed the coolant sensor and no change in problem. Could it possibly be the coil since it is just single coil rather than indv coil packs? Because the dash lights flash when it stalls on occasion

Steve99s70t5manual · Post by **Steve99s70t5manual** » 13 Jan 2018, 01:15

It kind of seems like it's starved for fuel when I'm trying to start it after it's stalled out. And I wonder if it might have to do with the evaporative codes because if there was no vent in the gas tank it would eventually have have a pressure release that might be the reason it has to wait so long before it starts again

Post by **RickHaleParker** » 13 Jan 2018, 01:23

Did you clear the codes? If so what came back?

Post by **wizechatmgr** » 13 Jan 2018, 01:24

Leave the gas cap loose to test that theory.

Did you check the resistance of the sensor before/after installation? Occasionally bad parts make it into customer hands. I'd say the odds are less than 1 in 100, but it still can happen.

When was the fuel filter last replaced? It may be original and full of crud.

I'd suggest bypassing the fuel pump relay with some 12 gauge copper wire hammered flat on the ends. RSPI has a video on how to do this at https://www.youtube.com/watch?v=gLoO-D4yOcU

When it does this, it sounds like you can't restart it. Are you able to hear the fuel pump start at all? If not, fuel pump or fuel pump relay.

Post by **abscate** » 13 Jan 2018, 05:49

If you didn't use a Volvo part for that coolant sensor return it and get the right one.

The time to diagnose it is when you can't restart, check for spark, check fuel pressure at rail.

Then follow the tracing on the no start thread on the appropriate fork.

On a -1998, check the fuel pressure regulator for gas in the diaphragm, too.

Vacuum leaks could also cause this running, check the elbow under the intake manifold and all those hoses for split

Finally check all the induction fat Air hoses by removing them , inspecting with flashlight, and replacing carefully with new clamps as needed.

A new to you car will likely have trouble in at least 2 of these areas.

Post by **FLXC90** » 13 Jan 2018, 08:14

Steve99s70t5manual wrote: ↑13 Jan 2018, 01:09 I already changed the coolant sensor and no change in problem. Could it possibly be the coil since it is just single coil rather than indv coil packs? Because the dash lights flash when it stalls on occasion

Look at the threads for ignition switch failure as well.

Caroline02 · Post by **Caroline02** » 13 Jan 2018, 09:41

Steve99s70t5manual wrote: ↑12 Jan 2018, 23:54 Ok I just bought a 98 S70 and the Ce light is on and the codes that come up are p0300,01 02,03,05 and the p0442 p0455 p0116. The coolant sensor was my first suspect but I changed it and it still stalls when it warms up. Now it runs beautiful from cold, like smooth idle and revs nice but I notice that the revs don't come down easy. Also once it has been running for 3min it starts to get the odd sputter and only gets worse until it totally stalls out. The guy I got the car from said a few times all the lights on the dash would flash and then the car stalls so if that helps please let me know. I also check the fuel pressure relay and it was ok. Any help at all would be great as I only have a 2day permit on the insurance and it is 40miles away from home at a gas station.

Where is the picture of this?

Post by **scot850** » 13 Jan 2018, 13:08

Can you clarify the year? In your details you say 99 S70 T5 and in the header for the thread you say 98 T5. These use different systems so just want to make sure we are helping you with the non-common parts of these systems. Only use OE coolant temp sensor as previously mentioned.

Neil.