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Well, if it has no lambda sensor he'll have to figure out where the problem is based on which gas it failed on. High HC and CO don't always go together. In fact they usually don't. I hope he has a NDIR gas analyzer, hopefully a 4 gas, otherwise he'll be feeling around in the dark. I know I'd be...

Dizzy? Have you an N/A? Replacing a head gasket could very well effect emisisons. Not so much because of the head gasket itself but because the exhaust and induction systems were removed. If they weren't put back on right it'd mess things up, especially if you do have a lambda sensor. I dunno...

No mate, it's because your crappy weather scrubs it all out of the air ;) What we're looking for here is to see if your O2 sensor is cross counting and what the ECU is doing. Direct measurement of the O2 sensor signal would be better but I'll settle for Vf. This is all for high CO. If you have...

The old two speed idle test eh? People in Cali should be so lucky. (Actually, those in non-enhanced areas are). By Vf I mean measure the Vf terminal in the diagnostic block to ground with a voltmeter. Do it at 2500 rpm, both with and without the T terminal jumpered to ground and report back...

A good thrashing won't help. It's running rich. CO emission should be lower than that even without a cat if the engine is running at stoichiometric. Check the O2 and Vf signals. Got any other emissions numbers?

Thought we were talking about turbos, that's where the confusion came in. The later Cali N/As had a sub O2 sensor plus the EGR setup. It's what code 27 and 71 are for.

Based on what you wrote it's not working because of bad connections in the battery circuit, one of which is the missing block ground. You may have already slightly cooked something. On most cars the engine is usually on elastomeric mounts. Same with the tranny and suspension. Starter current has...

Say what? You'd better have a big ass ground to the engine block or it's going to get interesting when the 200+ amps of starter current tries to find another way back to that chassis ground. I won't even go into all the other problems you can have without a block ground.

Lol, off topic but why in the world would anyone loan their money to the government interest free for an entire year?

It is an emissions thing. Just because you've "never had any problems" you could feel by leaving it open doesn't mean bad things aren't happening to the EFI system. I'd explain it to you but since you're so intent on crapping up the air I'm breathing I'll let someone else have that honor.

You could save yourself considerable time and money by testing those things rather then replacing them. Easy to do and you'll learn something. The less shotgunning of parts, jiggling of wires, or dancing around the car chanting while waving a bag of chicken bones and eye of newt the better off...

A excellent technically accurate post by 3p. It reminds me that although I've never mentioned it codes should be troubleshot starting with the lowest one first. That said in this case if it were me I'd address the code 31 first because from a technical standpoint it's far more serious.

Comments are welcome but they need to be informed. It'd take pages to explain but you must never lose sight of one thing: The TCCS controls fuel, timing, and idle. People either forget or don't know every sensor on the engine is involved with all three of those things. Take the TPS and O2 sensor...

At least somebody gets it. Before Shaeff posted I was going to list all the things that'd be adversely effected if he took that suggestion but I'm tired of refuting the "I did it and nothing bad happened" mentality. You'd think it'd be stupidly obvious TPS setting needs to be done right from the...

Check the crank pulley.

Well, if it's missing something you wouldn't know that unless you had a real one to compare it with now would you? To me that sounds like a another convincing argument for owning one. I didn't go all the way through the online copy but it appears to be missing something that would've saved him a...

Gas residue?! You honestly think the engine won't be dumping fuel in your oil on the very first and every cold start thereafter? Either flush it with fuel, alcohol, paint thinner, mineral spirits, or some other high vapor pressure solvent or purge it with dry air or a hair dryer for a few...

I don't remember what which terminals are which, I always check by signal name. I also check by voltage and not resistance because the ecu measures voltage. I seem to remember the outside two are IDL and E2 so you should have conitinuity on either the top or bottom two. If not it's toast. Not...

Pull the EFI fuse. If the TPS fails to check out per the TRSM it's bad. Just that your description in the other thread about what pins you were checking doesn't seem right. Since I said the idle might come down I can see why you thought I meant engine running. My bad. I was really talking about...

I mean on the engine harness. Engine not running. You don't normally check codes with it running do you? ;) Did you read the link jdub suggested? Two pins on the TPS are a switch, the other three are a pot. IDL and E2 should show continuity with the throttle closed and VTA should show a...