In The Shop

Discuss your Bonneville GXP and/or any other Northstar powered Olds or Cadillac... Including the Intrigue / Aurora 3.5L Twin Cam V6 (Short Star ) , 4.0L and 4.6L Northstar V8's. Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.
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SLOGXP
SE Member
SE Member
Posts: 16
Joined: Sat Feb 18, 2012 10:34 pm
Year and Trim: 2005 GXP Bonneville

In The Shop

Post by SLOGXP »

Well after I have only driven the car for a few months and a thousand miles, 68XXX on it now, I took it in for some extended warranty work.

Cluster - Sticking and erratic Speedo and Gas guage
Motor mount - lots of movement placing in gear
Oil leak - seems to be cooler hoses
Low coolant light just stated coming on

A friend started it up to meet me at the dealer and stated it ran a little rough when first started. I gave the advisor my list and off I went. Got a call the next day saying the tech did a block test and failed and believed it was the head gaskets. As I knew they were covered I authorized tear down. Well after tear down got a call and advisor said tech believed car had overheated at some point as pistions seem to have too much gap in them from cylinder walls. Tech also stated pistons were being cleaned from leaking coolant but it looks like the 2 bottles of Techron was cleaning up the carbon to me. I inspected the pistons and walls and found no scoring so im not buying the over heating issue. WTH is he talking about I thought. Advisor stated they were going to ask for new engine. Ok I said and out came inspector and denied claim, surprise. Long story short 2 inspectors came back out and authorized head gaskets. After more calls to insurance ( Ford Motor Co.), they also agreed to motor mount. Cluster will need to have Tech 2 print out to authorize...I guess needle stuck at 80mph doesnt count as faulty.

So I will have to wait till they get the engine back in. Cooler lines were wet and leaking but not covered under warranty so I ordered those, quick connects from my GM supplier that I get a discount from. Also going to have them install new O2 sensors as was planning on it anyways due to more fuel mileage, already did plugs, K/N, two bottles of Techron.

I also noticed some of the guide rails seem to have chain grooves wearing in them so ordered a new set before they put it back together $140.00. Front crank seal will be covered as part of the timing cover as well as valve cover gaskets.

Anyone have any other suggestions to replace with engine out at this point I maybe overlooking?

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sextrosgxp
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Posts: 123
Joined: Sun Jun 24, 2012 4:35 pm
Year and Trim: 2005 GXP
Location: Belleair, FL

Re: In The Shop

Post by sextrosgxp »

I'd have them check out the tranny to while everything is out of it. Sounds like the car may have been beat on so who knows how the transmission looks.
2005 GXP in Black
K&N Filter, tinted windows, tinted headlights, RVinyl fog light covers, Autosport cross-drilled and slotted rotors, EBC Red Stuff pads.
2012 Ford F150 FX2 Super Crew (Daily Driver) 5.0 V8.
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CMNTMXR57
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Posts: 5841
Joined: Wed May 13, 2009 10:45 pm
Year and Trim: 2006 STS-V, 2004 GTO, 2009 G8 GT
Location: CHICAGO

Re: In The Shop

Post by CMNTMXR57 »

Don't waste your time with another set of GM cooler lines. They'll just leak 15 miles down the road again anyway. That's just the one downside of the "quick-fit" setup.

Since that trans is out, I'd have it gone over once by a transmission shop, personally.

Not sure I'm following on the piston issue due to overheating. I'd be more concerned about head/block warpage and head gasket condition.
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Retired Bonneville Owner and former GM Tech:
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