20 Most Recent 2003 Fiat Siena Questions & Answers


If the oil appears to be coming out between the block and cylinder head, the suspect problem is a head gasket that isn't sealing properly. If you changed this out already and it's still doing it, the block AND/OR head itself may need to be shaved to correct a slight warp or bow which is keeping the gasket from doing it's job right. A quality machine shop can correct the head/block, and a good mechanic will know how to check to see if the block and cylinder head planes are in tolerance.

If the oil appears to be escaping from between the head and valve cover, you can try removing the gasket there, cleaning the valve cover AND the head around the edges with a degreaser and again with some towelettes with alcohol (after its been degreased), then applying a thin coat of RTV sealant to each side of the gasket before installing it and equally tightening the screws down. These gaskets are a little more forgiving (thicker) than the head gasket because the casting of the valve covers are not as tight, but a bad seal is a bad seal. Just be sure that when using RTV to seal a gasket, both surfaces its going to come in contact with is absolutely free of oil deposits or dirt so it can grip and do it's job. Allow the gasket to cure/dry according the directions on the product and do not put it on and start the car up right away or it'll just spread oil again and the seal will generally fail quickly.

2003 Fiat Siena | Answered on Nov 29, 2017


It sounds as if the belt is dry. Belts dry out after a certain amount of time and then start to make chirping noises. If the belt is not badly cracked, you can try using a belt lubricant spray. These sprays usually only last for a short period of time, though.

2003 Fiat Siena | Answered on Mar 28, 2014


check wiring to injectors . reposition the faulty injector to ensure that it is not electrical of connectors. Replace if necessary.

2003 Fiat Siena | Answered on Nov 02, 2013


check for vacuum line from intake assembly to brake booster. Check for cracks/ leaking. also check that the valve fitted in this line is not leaking. it definately is a vacuum problem

2003 Fiat Siena | Answered on Mar 14, 2013


i had a fiat punto that did this is it over heating as well if it is it has a colant air block sounds stupid but i have known and put wright at least a dozen of these and are all still running fine if not iregular idles are caused by faulty plugs faulty coil packs leaking hoses to carbs or injector could be faulty leads if you check the above im sure one of them will solve it cheers ivan

2003 Fiat Siena | Answered on Oct 10, 2012


there are no timing marks for camshafts you need a fiat tool to lock the cams rear of engine but if you mark the cam sprockets carefully before you dismantle you should be ok if not borrow the fiat tools the crankshaft marks are on the front pulley end about @aprox.10oclock position

Fiat Siena Cars... | Answered on Oct 19, 2017


Hi Tranhoai it could be the fan motor or the thermo switch. Try powering the fan directly if it turns its ok. Regards Jim...

Fiat Siena Cars... | Answered on May 14, 2015


The engine ignition system may be over advanced.

Fiat Siena Cars... | Answered on Apr 17, 2015

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