98 v70 Base Mutli Trouble Codes

Tuc28 · Post by **Tuc28** » 04 May 2010, 17:09

I just reviewed OBD II codes. Have p0300,p0301,p0303,p0305, p1507 and p1505. I have 194,000 mi on car. Plugs, cap and rotor are only a year old. Plugs look fine all but #3, looks wet but like its fuel not oil. Just purchased new coil (waiting for shippment). Car runs rough and sounds like CAT is Clogged or something amiss in it. Going to order an IAC motor also. Any other ideas on fixes or things to check and do?

Post by **jblackburn** » 04 May 2010, 17:19

Hmmmmmmmmmmmmmmmmmm.

Multiple misfires on all cylinders, and the IAC valve is angry.

Before you start ordering parts, go unplug the MAF sensor and take it for a drive. Does it run any better or feel a bit peppier?

It could also be a cam or crank sensor on their way out, but usually if they are working intermittently, they will also throw a code.

Tuc28 · Post by **Tuc28** » 04 May 2010, 17:21

Did the MAF Sensor on the way to work 10-13mi. It ran about the same, except for idle, it liked to die or stall.

Post by **jblackburn** » 04 May 2010, 17:25

It might be the coil then. Have you checked all of your air hoses?

I guess on yours, there's just one from the airbox to the throttle body - check to see if it's come loose at either end or blown a hole in it somewhere.

Just wondering b/c you say something feels like it's being held back like the cat.

Tuc28 · Post by **Tuc28** » 04 May 2010, 17:28

Yeah checked the hose yesterday when checking the IAC motor. they look clean with no holes. The IAC motor bearly makes a sound when key is fully on also.

Tuc28 · Post by **Tuc28** » 04 May 2010, 17:32

The CAT rattles but could be from the motor. It feels like your driving a dump truck at times lol. Vibration at Idle then smooths out till around 2500-3200rpm.

Tuc28 · Post by **Tuc28** » 05 May 2010, 16:19

Realy quick there is a vaccum gate under the airbox, does anyone know where this needs to go?

Post by **jblackburn** » 05 May 2010, 16:45

Under?

There's a cruise control pump under the battery, and a port on the BACK of the airbox for the air thermostat flap inside.

Any chance you could get a picture for us?

Tuc28 · Post by **Tuc28** » 08 Jun 2010, 09:16

It was the vac hose to open and close the gate on the bottom of the air box.
Well I have gone through and replaced the rotor, cap, wires, plugs, coil, IAC and crank sensor. The car still feels the same. Thinking of replacing the injectors and maybe fuel pump.