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Hey guys, I have a bit of a problem. I just acquired a 1998 V70R last week and it was fine until Sunday afternoon. The car currently cranks and sometimes catches a bit but never actually runs or idles. This is the sequence of events leading up to today:
- When I got the car, I noticed a hesitation when accelerating lightly. When accelerating lightly around ~2300 in 3rd/4th to get on the highway, the engine would cut out, the revs would drop, then it would pick back up. This would keep on repeating itself until you let off the accelerator and re-applied throttle and it would accelerate smoothly after that.
- The idle would also hunt up and down below 1000rpms and stalled on me once while reversing. I cranked it again and it started right up and stayed running until Sunday.
- Sunday, I went to get parts for the car and while pulling into a parking lot, so I slow down to turn and the RPMs drop to idle. I try to accelerate and the engine doesn't want to for about 3-5 seconds and then it did....for about 2 seconds and then it just stumbled and stalled out. It would start right up and just stumble and stall out again. By tapping the IAC, it helped a bit once but then nothing changed after that.
- I then proceeded to change the Cam Position Sensor to no change. It would start up and then die. I then changed the IAC. Same story, as it would start up and die again or just fail to start. I then changed the MAF. It idled a bit better but still no change as it would stumble and die or just fail to start. I also tried another coil to no avail. I unplugged the Throttle Position Sensor and it just refused to start.
- I had the car towed home and after getting it off the flatbed, it started right up and idled like nothing happened. Then I proceeded to work it by taking apart the intercooler hoses and found that the rubber elbow going to the throttle body had ripped on the backside. I cobbled something together to replace it while keeping the IAC hooked up and there's no vacuum leak as far as the intercooler hoses are concerned. However I can still hear a leak somewhere and spraying brake cleaner on the hoses doesn't change the idle when it actually runs.
- I then removed the fuel pump relay and checked it with a 12V source and it clicks like it should. I can also hear the pump priming when the key is in position II. When I push the nipple on the fuel rail, gas does gush out so I doubt it's a fuel problem. I still need to check if I'm actually getting enough pressure. If I'm not mistaken I should be seeing 42PSI?
- I also cleaned the throttle body to no avail.
- I also jumpered positions 1 and 3 on the relay board and checked the fuse for current draw and it is ~4-5 amps like it should be. This for me pretty much rules out a fuel delivery problem.
- The only thing I haven't done yet is pull the plugs but I honestly doubt they're a problem since they were replaced less than 3000kms ago, but I'll pull them to make sure if they're wet or not. The previous owner had the plugs/Cap/Rotor replaced and they all look new. However the wires haven't been changed so that might be a possible problem source so I'll have to individually test each wire to see if there's spark.
- I replaced the Crankshaft Position Sensor last, but the battery is pretty much flat from trying to start it so many times so I haven't been able to see if that's changed anything yet or not. The tachometer is always working so I honestly doubt that the Crankshaft Position Sensor will change anything.
- When it does actually idle, and you give it gas, it'll stall out right away. This leads my friends and I to think that my intake manifold is leaking....but I did spray brake fluid around there and the idle doesn't improve or change at all.
- When the car was running fine, off the throttle on the highway I'd see 20" of vacuum and at idle it'd be ~12". Also, I don't ever see any more than 3psi of boost with the actuator rod cranked all the way down. I checked my Boost Control Solenoid and from the part number I can gather from it, it appears to be off an S40...does that affect it in any way?
As of now, I'm at a loss as to what the potential source of the problem is as it should crank and start right up. This is really frustrating as I just got the car and it should be my daily driver so any help with this will be greatly appreciated! Whew, that was long.
Thanks!
- When I got the car, I noticed a hesitation when accelerating lightly. When accelerating lightly around ~2300 in 3rd/4th to get on the highway, the engine would cut out, the revs would drop, then it would pick back up. This would keep on repeating itself until you let off the accelerator and re-applied throttle and it would accelerate smoothly after that.
- The idle would also hunt up and down below 1000rpms and stalled on me once while reversing. I cranked it again and it started right up and stayed running until Sunday.
- Sunday, I went to get parts for the car and while pulling into a parking lot, so I slow down to turn and the RPMs drop to idle. I try to accelerate and the engine doesn't want to for about 3-5 seconds and then it did....for about 2 seconds and then it just stumbled and stalled out. It would start right up and just stumble and stall out again. By tapping the IAC, it helped a bit once but then nothing changed after that.
- I then proceeded to change the Cam Position Sensor to no change. It would start up and then die. I then changed the IAC. Same story, as it would start up and die again or just fail to start. I then changed the MAF. It idled a bit better but still no change as it would stumble and die or just fail to start. I also tried another coil to no avail. I unplugged the Throttle Position Sensor and it just refused to start.
- I had the car towed home and after getting it off the flatbed, it started right up and idled like nothing happened. Then I proceeded to work it by taking apart the intercooler hoses and found that the rubber elbow going to the throttle body had ripped on the backside. I cobbled something together to replace it while keeping the IAC hooked up and there's no vacuum leak as far as the intercooler hoses are concerned. However I can still hear a leak somewhere and spraying brake cleaner on the hoses doesn't change the idle when it actually runs.
- I then removed the fuel pump relay and checked it with a 12V source and it clicks like it should. I can also hear the pump priming when the key is in position II. When I push the nipple on the fuel rail, gas does gush out so I doubt it's a fuel problem. I still need to check if I'm actually getting enough pressure. If I'm not mistaken I should be seeing 42PSI?
- I also cleaned the throttle body to no avail.
- I also jumpered positions 1 and 3 on the relay board and checked the fuse for current draw and it is ~4-5 amps like it should be. This for me pretty much rules out a fuel delivery problem.
- The only thing I haven't done yet is pull the plugs but I honestly doubt they're a problem since they were replaced less than 3000kms ago, but I'll pull them to make sure if they're wet or not. The previous owner had the plugs/Cap/Rotor replaced and they all look new. However the wires haven't been changed so that might be a possible problem source so I'll have to individually test each wire to see if there's spark.
- I replaced the Crankshaft Position Sensor last, but the battery is pretty much flat from trying to start it so many times so I haven't been able to see if that's changed anything yet or not. The tachometer is always working so I honestly doubt that the Crankshaft Position Sensor will change anything.
- When it does actually idle, and you give it gas, it'll stall out right away. This leads my friends and I to think that my intake manifold is leaking....but I did spray brake fluid around there and the idle doesn't improve or change at all.
- When the car was running fine, off the throttle on the highway I'd see 20" of vacuum and at idle it'd be ~12". Also, I don't ever see any more than 3psi of boost with the actuator rod cranked all the way down. I checked my Boost Control Solenoid and from the part number I can gather from it, it appears to be off an S40...does that affect it in any way?
As of now, I'm at a loss as to what the potential source of the problem is as it should crank and start right up. This is really frustrating as I just got the car and it should be my daily driver so any help with this will be greatly appreciated! Whew, that was long.
Thanks!
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