Finally pushed the new engine hard today, smokes like a diesel and smells like sulfur

LarsD · Oct 30, 2011

Finally got enough miles on the clutch that I could beat on the car a little today. Was rolling down my road and did a few rolling pulls in 3rd and 4th. Feels pretty good, but I looked in the rear view at one point and noticed that it was smoking pretty hard. Now that car is running on basically a stock tune with the exception of a couple of tweaks (24lb MAF with 30lbs injectors, deleted EGR and TADS). I think the smoke was blue, but it was hard to tell in a mirror while going 70+ mph. The thing that got to me was the car started to smell like sulfur, and I don't mean the faint odor, it REEKED. I slowed down and started rolling normally, the smoke went away as did the smell. What is this?

Engine is a 347 with about 500-550 miles on it, TFS heads, comp cam, 30lbs injectors, 24lb MAF, TFSR intake. Also, my speedo is reading 55mph when I am actually running about 65mph (according to my GPS), I already have the 19 tooth gear in it and an 18 tooth on the shelf. I don't think that will be enough though. What are my options here?

Thanks

Edit to add: OK, well apparently there is a high amount of sulfur in fuel from the refining process. I suppose the car is running rich on the top end (smoke) which ties in with the smell.

Boydster · Oct 30, 2011

Is there an advantage to running mis-matched MAF and injectors? If not, I'd straighten that out and see how it runs...

LarsD · Oct 30, 2011

Boydster said:
Is there an advantage to running mis-matched MAF and injectors? If not, I'd straighten that out and see how it runs...

No advantage, it's just what I had on hand. I'm running Quarter Horse, so it *should* be irrelevant.

Incidentally, what is this? Anybody know? It's in between the transmission speedo cable, and the cable that runs to the cluster.

Boydster · Oct 30, 2011

Ah, Quarterhorse, gotcha. That mis-match seemed way too basic for someone like you to have missed.

LarsD · Oct 30, 2011

Boydster said:
Ah, Quarterhorse, gotcha. That mis-match seemed way too basic for someone like you to have missed.

Yeah, I don't imagine it would have run very well that way. lol

BlackGT89 · Oct 30, 2011

When I hear "sulfur smell" it makes me think of the catalytic convertors having trouble cleaning up the exhaust. Are you still running cats ? If so, are you still running the air pump and all of the emission equipment? Does it smoke when you get on it, or when you let off (when the vacuum is high)?

stykthyn · Oct 30, 2011

I have also had a ffailing egr cause the sulfur rotten egg smell.

stykthyn · Oct 30, 2011

That shouldn't be your issue if you were at wot though.

LarsD · Oct 30, 2011

BlackGT89 said:
When I hear "sulfur smell" it makes me think of the catalytic convertors having trouble cleaning up the exhaust. Are you still running cats ? If so, are you still running the air pump and all of the emission equipment? Does it smoke when you get on it, or when you let off (when the vacuum is high)?

I had my foot in it pretty hard. No cats, no smog pump, pretty much no emission at all (PO took them all off before I bought it).

stykthyn said:
I have also had a ffailing egr cause the sulfur rotten egg smell.That shouldn't be your issue if you were at wot though.

Yeah, EGR is disabled as well. Is it possible that the car is just too rich?

Maryland Stang · Oct 31, 2011

LarsD said:
Incidentally, what is this? Anybody know? It's in between the transmission speedo cable, and the cable that runs to the cluster.

It looks like a speedometer correction gearbox. Speedometer Ratio Correction

LarsD · Oct 31, 2011

Maryland Stang said:
It looks like a speedometer correction gearbox. Speedometer Ratio Correction

That's what I was thinking. I'm running 3.55's and 25.68 tall tires, and with a 19 tooth speedo gear I am still over ten miles an hour slow @ 55.

bgoins · Nov 2, 2011

I'm sure this is unrelated but the only time I've smelled sulfur on a car was when my battery went bad.

LarsD · Nov 3, 2011

bgoins said:
I'm sure this is unrelated but the only time I've smelled sulfur on a car was when my battery went bad.

Funny thing is, it died on me on my way to work the next day. Found the pos terminals on the starter solenoid were loose however.

88-378 · Nov 3, 2011

run it! and drive it like you stole it...

That's what I am told now that everything checked out. compression, leakdown, etc...

I have a similar situation as you. Check to make sure everything is ok, then run it!!!! I am getting about 2.5 ounces every 500 miles in a seperator with a pcv. I only have about 2K on the motor. It was already dyno'd etc... I do need a re-tune tho...

Noobz347 · Nov 3, 2011

LarsD said:
No advantage, it's just what I had on hand. I'm running Quarter Horse, so it *should* be irrelevant.

Incidentally, what is this? Anybody know? It's in between the transmission speedo cable, and the cable that runs to the cluster.

LarsD said:
I had my foot in it pretty hard. No cats, no smog pump, pretty much no emission at all (PO took them all off before I bought it).

Yeah, EGR is disabled as well. Is it possible that the car is just too rich?

So are you attempting to tune this car through a quarterhorse with no reference to your AFR? What wideband are you running?

LarsD · Nov 3, 2011

Noobz347 said:
So are you attempting to tune this car through a quarterhorse with no reference to your AFR? What wideband are you running?

No wideband. I'm planning on taking it to a dyno tuner who has more experience then me with QH. I think it just needed to be ran hard, cause it only did it that one time, and I have run it pretty hard a few times since.

Noobz347 · Nov 3, 2011

I wouldn't be running it hard at all! I'd be limping it aournd until I at at least SOME idea of where the tune is at.

BlackGT89 · Nov 3, 2011

Sounds like it's clearing up and that's good. Maybe it just took a while for the rings to seat. I know there are lots of opinions about break in procedures and I don't want to open that can of worms. But one thing that does seem to be agreed upon is an early oil change interval for the first two or three times.

88-378 · Nov 3, 2011

BlackGT89 said:
Sounds like it's clearing up and that's good. Maybe it just took a while for the rings to seat. I know there are lots of opinions about break in procedures and I don't want to open that can of worms. But one thing that does seem to be agreed upon is an early oil change interval for the first two or three times.

I agree! And no synthetic or semi-synthetic.

LarsD · Nov 4, 2011

BlackGT89 said:
Sounds like it's clearing up and that's good. Maybe it just took a while for the rings to seat. I know there are lots of opinions about break in procedures and I don't want to open that can of worms. But one thing that does seem to be agreed upon is an early oil change interval for the first two or three times.

88-378 said:
I agree! And no synthetic or semi-synthetic.

Yeah I followed Woody's break in advice. No synthetics, first oil change @ 100 miles, 2nd oil change @ 200 miles. I'm not beating on it. Just rolling into the throttle till about 4K while in 3rd or 4th gear. Did take it up to 5K once though. All seems fine. Just not as fast as I'd hoped. :-/

Finally pushed the new engine hard today, smokes like a diesel and smells like sulfur

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