Throttle body cleaning issues EPIC Volvo saga...RESOLVED!!

[precopster]

Just replace this: http://www.fcpeuro.com/products/volvo-t ... 0280750131

No need for adaptation. Just make sure the codes are cleared before starting the engine (if you have any)

It will then start at around 1,500rpm then slowly re-adjust over about 2 miniutes

[chrism]

If it has come to the point that the solution to the problem may be to go out and purchase a $300+ part, wouldn't it be prudent to spend a few bucks to have the codes scanned to see if they point to the same culprit?

[precopster]

OP hasn't stated there are codes. Often throttle issues present with none.

OP if you're out there it would be a great idea to read codes. Personally I would have just concentrated on the throttle issue. A blocked PCV isn't known for causing varying idle or hunting.

Removing the throttle to clean takes around 30 minutes.

[sergio]

Codes; please note that these codes came AFTER I cleaned the TB and PCV. Not before

P0068 MAP/MAF Throttle correlation
P0126 Throttle/Pedal position sensor A circuit High input
P0222 Throttle/Pedal position sensor B circuit Low input

Again these are here after the work. I don't remember what it read before the "clean up"

The oscillating idle would come on right at the start. I would let it run couple of minutes then stop - restart the engine and it would run smooth for several more no-problem starts. Very sporadic.

[chrism]

Other than cleaning the throttle body, troubleshooting the throttle system is uncharted territory for me. But if I didn't know better, I'd say those codes sound more like a problem with the throttle pedal switch rather than with the throttle body itself. We need the input of a more seasoned expert.

[sergio]

Calling for more seasoned expert
need a car, preferably my S60

[precopster]

The code reader you have can only bring up codes. You now need detailed analysis of each componont. Do achieve this at a reasonable price you need a Vida/Dice setup. They're all over eBay and Alibaba and range down to $120 delivered.

While idling at 580 rpm the MAF part number 02802180888 should be providing a reading of approx. 18kg/hr air reading.

When the poor idle occurs you can analyse the pedal position and see whether it rises in a smooth linear percentage on the readout. If not replace pedal sensor.

The Bosch throttle body has a resistive film which can get dirty and cease to provide correct output to the car's ECU. The throttle angle can be viewed in Vida and again you are looking for a smooth linear percentage change in throttle angle when drilling down in Vida. This throttle can be cleaned. The unit has stainless snap locks around the body which can be removed. I recently cleaned a Bosch throttle body's contacts in an '03 XC70 and made it worse, necessitating replacement so if you're going down this path have a boxed one on hand.

So to sum it up analyse MAF, throttle body and throttle pedal sensor. The analysis will give you feedback; hopefully enough to reach a decision on what to replace.

[chrism]

Ooops. (Duplicate post.)

[sergio]

Hi and thank you precopster

I'm taking your advice for getting a DICE, I have an old VADIS.

Now, you mentioned 120$ delivered. Could you give me one or two seller name you trust (have dealt with?)
I found http://www.bestcardiag.com (they promise 3-5 days delivers for +-$150) I am sure their software is a copy, probably so is the DICE device.
There is also "421 auto" where it cost more and ships 14 days after receiving full amount


Thank you.





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[precopster]

Just read their feedback; eBay sellers come and go. I don't recall who I bought mine from as it was over 16 months now.

Lots of sellers on Alibaba. Check feedback. Some allow credit card payment and others Escrow or Western Union. There is a seller on Alibaba named Shenzen Digobd or something to that effect;they sold me a faulty unit then were impossible to contact. I have blacklisted their exact name in Garages and parts suppliers here on Matthews.