97 Q45 Engine bucking

[japaneseq]

I have Engine bucking issue while driving. Service engine soon light on and code was EGR valve.

I wonder clogged EGR valve is causing engine to buck???????

[maxnix]

Please detail the engine's maintenance history for us, paring particular attention to the fuel and intake system.

[BadQ45t]

He's right, what have you done service wise to the engine. When was you last fuel filter change? List everything you have done or the PO did to the car.

[japaneseq]

I do not have a history. I bought this car as a spare. Previous owner told me I need water pump replacement. I took his word for it and replaced anyway. But old water pump was good. After that I found radiator hada pine hole loosing coolant. This may caused engine damage!???I replaced radiator and alternator had excessive spikes and replaced also.Spark plugs are good. I only drive about 100 miles on weekend. I smellcoolant but no external leak.

[elwesso]

if anything the EGR would cause bucking because its staying open or is open at the wrong times.... My guess is you have something else, along the lines of a MAF problem or something...

[joneil1129]

I have a 94 Q45 and it's doing the same thing I haven't done anything to it yet because I realy don't know where to start my engine bucks after the car warms up at about 60mph.. where should i start first???