Idle issue, clicking noise, and CEL???

[OxmanWI]

I have a 1998 SHO

Every 10 seconds or so when the engine is warmed up the RPM's will jump from a normal 700 to 1200 and there will be a clicking noise before the jump in RPM's.

I also have 4 codes on the CEL for the following:

P0171 System too Lean (Bank 1)
P0174 System too Lean (Bank 2)
P1000 = OBD-II Monitor Testing Incomplete
P1260 = Theft Detected - Engine Disabled

I’m pretty sure I’ll need new O2 sensors for the lean codes, but I’m confused about the last two. How can I fix these?

Any help is much appreciated,

Josh

 

[SHOZ123]

If the cams aren't welded then turn off the motor and do not restart it.

 

[OxmanWI]

According to V8SHO.com there is a shop in Madison that does the welding. I really don't think I can afford to tow it out there so I think I'll take my chances and drive it out there. Any insight on my current posted problems?

 

[93rev2sev]

I second that...sounds like you have acheived VVT.

DONT try to drive it.!!

 

[OxmanWI]

I second that...sounds like you have acheived VVT.

DONT try to drive it.!!

Huh? Variable valve timing? Is that what you are talking about? Please explain?

Thanks,

 

[SHOZ123]

It's about ready to blow. If it were me I would not even turn the motor over again. Or risk looking at a +$2000 repair bill.

 

[OxmanWI]

So what do I do? Have it towed to Madison? How much does the cam weld normally cost?

 

[SHOZ123]

You should ask what they are charging in Madison. If it is the sprocket slipping then it could go at any time. Maybe with the next engine revolution.

 

[OxmanWI]

When I said "clicking” it clicks (clicks once) every 10 seconds (with a raise in RPM’s) as if something is turning on and off. I'll have to take a video clip of it, but now you got me scared, lol! I'll give Madison a call tonight too.

 

[93rev2sev]

Yes...VVT was meant to indicate variable valve timing. Not something designed into the engine...IE...very bad.

The thing that scares me is the raise in RPM when you hear the clicking noise...

If the clicking is every 10 seconds like you say, it could just be the a/c compressor cycling.

If it's a single click and a raise in RPM, you may have nothing to worry about...but with these v8 SHO engines, you will be lucky if you get ANY warning that the cams are about to liberate themselves from the sprockets.

Have your cams welded.

Tow it in.

Bite the bullet now...or eat it later.

Here's what happens...

Cam slips on sprocket > Valve timing gets ********> valve stays open as the piston approaches TDC > valve get a scared look on its face as the piston screams up towards it > valve says..."oh shit...I should be closed by now...and here comes the piston">valve stays open>valve stays open>valve gets decimated by piston>you pay multiple thousands or part out the car.

 

[OxmanWI]

Yeah that's what it sounds like, the compressor engaging or something to that extent. Believe me, I would have not bought the car if I heard a clicking noise coming from the valve cover area, lol. I have good performance with smooth idling except when in PARK with the 10 second clicking happens. I plan on having the cams welded very soon.

 

[66goat]

those codes may be clues that somethingis going on w/the cam sprockets but If you feel lucky try shutting the climate control off. If the cycling stops the a/c is the cause.I would still get the cam sprockets welded ASAP, I drove mine for a nervous few weeks before it was welded,I did not however have any clicking noise or engine codes.I i did it would have been towed to NESHO.

 

[stephen newberg]

I strongly suggest that you do not turn the engine over again until you have had the cam sprockets welded or by disassembly made sure they are already welded. This sounds to me like you could easily be close to the fatal sprocket slippage situation as mentioned by other posters above.

pax, smn

 

[OxmanWI]

Trust me I know I have to have the cams checked and welded if need be, that's no problem at all. I did find the reason with the clicking issue. It does have to do with the climate control, I simply turned it off and the clicking went away. I just bought two new O2 sensors and having them put in tomorrow to see if that clears the lean codes. As for the welding, it's going to be done very soon.

 

[me6894]

a lean code isnt necessarily a bad O2 sensor, it could actually be because of a lean condition such as your fuel pump about to take a dump, FPR... etc.

 

[SHO#7]

As a norm, when I see lean codes in bank one and two. I would suggest there is a vaccum leak, or a mass airflow sensor going out of range.

If it is just one click, I would think the cams are not the noise. Go to V8SHO.com and look around. There is a video posted of a car with cam noise. Just be smart about it. You will be very sad if a sproket slips. You may think it can not happen to you, but it can.

Mike

 

[66goat]

Glad to hear it was the climate control Clicking on and off, Good luck w/ the rest