Last post on Aug 29, 2012 at 8:25 AM
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Volvo S70, Engine, Sedan
#7 of 16 No start (crank but not run), water coolant sensor, radiator fan relay
Jan 02, 2008 (10:39 am)
Problem: No start (crank but not run), water coolant sensor, radiator fan relay.
Model: S70, 1998, 2.4 engine.
Situation: Will not start (crank but not run), when cold
plus cooling fan runs after cranking engine.
Repair items which made no difference:
new fuel filter - located by passengers rear tire = $30.
new spark plugs - located engine center under top cover plate (Bosch +4) = $35.
new battery = $65. - love that squeeze type connector.
sensor MAF mass air flow:
located in top corner of intake air filter box.
yes engine will stall when repluging in connector - shows it is working..
Repair items which solved the problem:
sensor water coolant temperature: (eEuroparts.com $30)
plug located by thermostat just under top radiator hose.
unplugged sensor = cold 5.00 K ohms, = hot .36 K ohms.
other side of plug to ECU = cold 5.56 K ohms, = hot 5.59 K ohms.
yes if you run engine with this unplugged check engine light will need resetting.
reset using DTC plug with ODB reader with reset - or Volvo dealer.
plug located in arm rest by drivers seat.
Engine would not start when cold because Electronic Control Unit, (ECU) viewed the engine as warm. This was indicated by the cooling fan running after the no start cranking.
No there was no DTC codes showing.
No check engine light was not showing
No the fan relay was not defective.
No the fuel filter was not clogged.
No the fuel pump and check valve was not defective.
No there was good spark to the ignition.
No the key switch was good.
The water coolant temperature sensor seemed ok, did not check to be bad.
How to get running even with this no cold start situation.
(1st way) Open up air intake by loosing hose clamp on rubber flex hose, slide hose back,
Add 3 or 4 tablespoons of raw gasoline.
Start the engine, with full throttle peddle.
This will provide enough fuel to start the cold engine.
The engine will run because there is nothing wrong.
(2nd way) Unplug water temperature sensor
(slide connector off tab holder, squeeze the lock, unplug the two wire connector)
Start the engine. Proves this to be problem.
The problem is the ECU does not provide more fuel for the cold start up because it considers the engine as warm.
Solution: Unplugging the water temperature sensor, this allows the engine to start on a cold 40 degree morning. During this situation of running engine with everything cold and the sensor unplugged apparently the ECU reset itself. After this I simply repluged the water sensor and problem was gone, with exception of check engine light. However this only lasted 2 days then problem reappeared. Then would start only if you turned the key 2 times. Then would not start at all. I then unplugged the temperature sensor and instant start, (rough running until warmed).
I installed new water temperature sensors, problem solved, very easy to do. You don't even have to drain water from radiator (will be a small fluid spill). Remove thermostat cover (Torx screws) unscrew coolant sensor, screw in new one, reinstall thermostat cover, connect wire for sensor, job done, add a little coolant.
#8 of 16 volvo s70 cranks but will not start!!!
Jun 02, 2008 (6:18 pm)
My friend has a 1999 volvo s70 2.5L turbo that will not start and I cannot figure out what the problem is. A little backround on the car: it was stolen a while back but recovered, we have no idea what happened to the car while it was out of his possession. When we got it back the intercooler was broken but we replaced it and it ran fine afterwards.
He was driving down the road few months later when the oil light came on. He put some oil in it, but it took a while to crank it to start. That lasted for a week until it died whle driving down the road. Then it still took a while to try to crank but never quite turned over, and the battery would drain before it would turn over. so now we have checked the filters and injectors ant they all look fine. the coils all have cracks in them, could the be shorting out through the head and not be getting any spark to the plugs or is it somthing different? We are going to do a compression test soon and i will let you know what the results are.
I know problems like this are hard to describe over the internet so if you have any questions, i will do my best to answer them, any help that you could provide would be very useful. Thank you in advance!!!!!
#10 of 16 volvo s70 stalls
Mar 12, 2009 (12:10 pm)
I've put a fuel pump..filter and mass air flow sensor in it and it still stalls...no codes or check engine light comes on
#11 of 16 Volvo S70 GLT
Dec 05, 2009 (3:49 am)
Any ideas on a cold starting problem? My 98 S70 requires several key turns to start when the outside temp is below 30. I replace the coolant temp sensor, and the thermostat. When I turn the key I noticed that the radiator fan is running, even at a cool start. Is this normal?Once the engine does start it idles down and turns off, which I have to restart and give a little gas pressing the gas paddle before it will run on its own.
#12 of 16 Re: Black exhaust and stalling problem [bobkol]
Mar 25, 2011 (10:59 pm)
Here's an FYI to everyone who has had this problem. I have read countless posts and followed much useful advice. I changed the temp sensor, the fan control relay, the maf sensor and the fan ran continuously. I finally found that none of these parts had been bad. When changing the temp sensor, I failed to notice the tremendous amount of corrosion inside the positive terminal of the sensor connector. Cleaned this, put dielectric grease on it and it sured the hard starting, the fan running and the lack of boost from the turbo. $250 in un-needed parts and several hour in wasted labor all because of corrosion in a connector. Always check the simple things first! Apparently a bad signal from the temp sensor causes multiple problems such as hard starting, fan override that forces the fan to stay on in 'safety mode' and it also tells the ecm to kill the turbo boost. Hope this helps.
#13 of 16 Starter Troubleshooting
Apr 20, 2011 (6:19 pm)
Battery is a few months old and strong. Car was not starting quickly. Today it ceased to start. No reaction upon turning the key. Tried jumping - but not necessary - battery strong, headlights and accessories unaffected. How do I diagnose this? How do I test the solenoid and then the starter?
Nov 07, 2011 (12:30 pm)
Love my Volvo. Have not had bad problems with it until now. It will die while idelling and then not start/run back. It will turn over like it wants to start but won't. I get occasional exhaust smell and bad mileage. I average 22 miles to the gallon. Saturday I got 12. It has died sitting at lights. I've had to put it in neutral, foot on brake and gas in order to keep it running. Sometimes it will start and run with no problems, sometimes not. It even hesitates while driving down the road. When it started I thought I had gotten bad gas. In two months I have replaced the catalyc converter, 2 vacuum hoses, and the air flow sensor ( 3 times). When hooked to a computer it says air flow, so we initially thought we were getting bad parts. My mechanic has even taken it for a second opinion cause he's as stumped and aggravated as I am. Any suggestions?
Nov 26, 2011 (10:13 am)
Hi my 99 s70 will not start after replacing the radiator. I had to disconnect alot of electrical wires which ran across the fan shroud and reconnected them. The car turns over but will not start. I did not disconnect the battery while I did the change does this matter?
#16 of 16 Re: stall & Die [sickwithit]
Aug 29, 2012 (8:25 am)
I have the exact same problem at present! HELP!!! I hope you can reply to this and help me find the solution!!! It would appreciated..Thanks ...Frustrated