NU V8 breaking down under acceleration

[5.8]

Hello all, hoping for some advice.

My 2001 NU V8 Fairlane Sportsman has developed a problem when under heavy acceleration. Anything more than about 2/3 throttle it breaks down (misfires/splutters) and seems to make a squealing noise from the engine similar to a belt slipping noise. I have recently replaced both tensioner adjustment pulleys and the serpentine belt as well as the coil packs. I disconnected the wire from the abs/tcs module today to see if it was that playing up however it still did it.

I don't drive the car very often and only run it on 98 fuel. It still does it with fresh fuel.

Any ideas would be appreciated.

[MrEL]

Cam sync sensor or leads.
Check the leads for sparking between each other with it idling in the dark.

[NCII40]

Fuel Pump

[5.8]

Thanks fellas,

The leads are good, no sparking.

I'm going to have a good look at the harmonic balancer today to make sure its not cactus however I'd imagine if it was starting to move on the rubber I'd feel a vibration through the engine. It makes sense of what the squealing noise might be though.

After that it's off to the mechanic for a test of the fuel pump and if that's all good I'll start looking at the cam sync sensor.

[V8falcons]

a cam syc sensor will squeel when its dead..

[auIILTD]

Originally Posted by V8falcons

a cam syc sensor will squeel when its dead..

V8falcons is on the money. I have had a cam sync go before. It made the squealing noise you refer to. My symptoms were spluttering under any load. Each case is different I guess.

Cheers
Stu

[5.8]

Thanks Stu,

The harmonic balancer looks fine, no wobble and I'm figuring if it was no good I would have a vibration.

I ordered a Dorman cam synchroniser through Rock Auto in the US. For about $85 delivered I'll take a punt and replace mine and see how we go.