1998 2.0 petrol Rav 4 - Rough running

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Mon 12 Nov 2012 19:31
1998 2.0 petrol Rav 4 - Rough running - What car next

My wife's Rav 4 runs roughly when travelling at a steady speed. It's fine when accelerating - no lack of power and ticks over very steady too. I've changed the coil packs and leads and plugs, as well as the fuel filter but with no difference. Toyota main dealer couldn't find anything on the diagnostic check - any ideas? Could it be the injectors? It's only done 94k miles. Thanks.

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Tue 13 Nov 2012 08:26
1998 2.0 petrol Rav 4 - Rough running - madf

Check and clean MAF sensors.. Any dirt/rubbish will affect fuelling and NOT show on any diagnostics.

Note: delicate operation : care needed. Google a how to do it...

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Tue 13 Nov 2012 12:51
1998 2.0 petrol Rav 4 - Rough running - What car next

Check and clean MAF sensors.. Any dirt/rubbish will affect fuelling and NOT show on any diagnostics.

Note: delicate operation : care needed. Google a how to do it...

Thanks for the tip. As my Rav is a 1998, I don't think it has a MAF sensor (2001 onwards according to my Haynes manual) BUT it does have a Manifold Absolute Pressure sensor which I presume does a similar job to the MAF. Anyway I took this apart, cleaned it and re-connected it and it seems to have improved the running - it did have some water on it. Fingers crossed!

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Thu 15 Nov 2012 11:04
1998 2.0 petrol Rav 4 - Rough running - What car next

Unfortunately not totally cleared the problem - maybe a new MAP sensor is needed. Could a MAP sensor be faulty and not show up on a diagnostic check? I don't want to shell out for a new sensor if it's not the problem. I've checked the hose between the manifold and the sensor and it seems ok. Is there anything else that could be causing the problem? Thanks.

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