1999 V70R engine surges

chrispassmore · Post by **chrispassmore** » 17 Apr 2012, 11:49

My car has started doing this and it's getting worse... at start up, it sometimes stauls out and it takes several attempts to get the engine to crank back over. In park and in drive when coming to a stop, the engine surges between 700 and 1,000 RPM's. It sounds really bad in park. When I'm slowing down to stop, sometimes the car will actually surge forward a bit.

Last night i unplugged the battery for about 15min. The check engine light went away and the surge has lessened a little bit, but it's still there.

Might be important to note I have had a coolant leak for a few months.

HELP?!

Alwick · Post by **Alwick** » 17 Apr 2012, 13:42

If you have a CEL, get your codes read.
Resetting it and hoping it will go away is not going to work.

SpeedyPete · Post by **SpeedyPete** » 17 Apr 2012, 19:21

Hi Chris

A common reason for these cars surging without any codes is a bad MAF sensor. Just unplug the electrical sensor connector while it is surging and if it smooths out you have a bad MAF. Replace these units with Bosch only. Do not by any means use an aftermarket brand. These cars are very picky. BOSCH ONLY MAF

Best Regards, SpeedyPete

chrispassmore · Post by **chrispassmore** » 18 Apr 2012, 08:50

SpeedyPete wrote:Hi Chris A common reason for these cars surging without any codes is a bad MAF sensor. Just unplug the electrical sensor connector while it is surging and if it smooths out you have a bad MAF. Replace these units with Bosch only. Do not by any means use an aftermarket brand. These cars are very picky. BOSCH ONLY MAF Best Regards, SpeedyPete

Pete, thank you! Where is the sensor connector?

Post by **rmmagow** » 18 Apr 2012, 08:54

big tube from the air cleaner to the throttle, you'll see a plastic thing attached to the top of the air cleaner cover and that will have a electrical connector. Press down on the metal piece on the connector and wiggle the connector off.
This sounds like the MAF, my V70R (98) did that same thing, MAF fixed it.

SHAKAMAMBUTU89 · Post by **SHAKAMAMBUTU89** » 18 Apr 2012, 09:38

Hi. It could also be the gas you are using. Are you using 87 or 91? Because I have a 98 T5 and because I am using 87, my car is trembling and sometimes sounds like its on the verge of shutting off. Just a thought, hope it helps

My car does very similiar things to your car too.

chrispassmore · Post by **chrispassmore** » 18 Apr 2012, 11:47

SHAKAMAMBUTU89 wrote:Hi. It could also be the gas you are using. Are you using 87 or 91? Because I have a 98 T5 and because I am using 87, my car is trembling and sometimes sounds like its on the verge of shutting off. Just a thought, hope it helps My car does very similiar things to your car too.

You don't work for Exxon

Mobil do you?!?!?! Just kidding. I'll give that a try!

chrispassmore · Post by **chrispassmore** » 18 Apr 2012, 11:48

rmmagow wrote:big tube from the air cleaner to the throttle, you'll see a plastic thing attached to the top of the air cleaner cover and that will have a electrical connector. Press down on the metal piece on the connector and wiggle the connector off.
This sounds like the MAF, my V70R (98) did that same thing, MAF fixed it.

Thanks! I'll give that a try.

SHAKAMAMBUTU89 · Post by **SHAKAMAMBUTU89** » 18 Apr 2012, 15:13

LOL! But just to make sure, what gas are you using atm?

chrispassmore · Post by **chrispassmore** » 18 Apr 2012, 15:22

SHAKAMAMBUTU89 wrote:LOL! But just to make sure, what gas are you using atm?

Cheapest possible..