I replace the cast iron exhaust manifold 4 yrs back with converter integrated on it, common problem them is cracking, has had crack since Jan but not bad an warms up good it goes away, but when start on cold start. More do, , every start a lil, it runs rough for 10 seconds or a lil more until exhaust manifold metsl where crack expand an start seal leak, the shop Say a month ago that shouldn't hurt nothing ? Not bad on valves ? Or do somethknv to variable speed timing ? Thinking of blow up to whole $1000 bucks get fix. Not wsnt to go back an put off, a anyone know when start cold start an run rough 10-15 seconds until leak seal self. If possibly bad ?

Is it groundhog day
I'm feeling like Bill Murray

Never heard of a cracked manifold on an old clunker hurting anything.
Somebody trying to separate you from your money.

No, the shop said it wouldn't hurt anything. He thinks they're lying, lol.

The first time replace , much worse, I took shop, drove home. Drove old truck work, drove shop windows down, loud. ! Carbon monoxide go though vents st u , it was much worse crack, more concern if damage something on motor on cold start when run rough for 10 seconds until metsl expand an seal leak.

Sounds like your truck is junk.

Time to scrap it and buy a bicycle !!!

You are screwed, coonman !!!!

BOHICA !!!

Is everyone nearly as sarcastic as u in that part country ? Or is that u normally like ?

Give walleyed a break, this is at least the third time you've asked about the exhaust manifold on your truck.

Don't pay attention to Walleyed. He likes to rattle people. I think your truck is running ok. Just remember to check fluids and change the oil. I don't think you need to worry about the truck.

X2 what dkrug says.

A crack in the manifold will allow air into the exhaust, This fresh air in the exhaust can skew the readings of the oxygen sensors. Not a big deal for the sensor after the cat, but if it is the sensor in the manifold next to the head, this can affect the fuel:air ratio being supplied to the engine. That may be why it runs a bit rough when it is cold.

I've "heard" of guys replacing their O2 sensor with a dumby one that effectively bypasses that reading.

Trying to give you some sound advice, coonman.

A bicycle would give you many years of useful transportation
and fewer parts to diagnose when you have a mechanical issue.

Scrap the Colorado and use the proceeds to buy a used, serviceable bike.

You'd save in repair bills, get good exercise, and help save the planet !!!

It's a WIN=WIN situation for everyone !!!

You'd get dependable transportation, and we'd be spared a weekly diatribe
on your vechile woes !!!

Carry on, coonman.

w

Coonman --go to AutoZone and buy the compound that seals small holes and cracks in manifolds. I have used it and it works. Cheap too!

Thanks for advice , but in cast iron, cracked. Replace is all do. My ancient junk 87-S10, which never drive much, save emergency vechile. Should be junked, would not trust all, or shutoff if went somewhere, N bad rust throughout an frame, not to safe. Anyway that has aluminum manifold an was successfully welded years ago

There is a O2 sensor go right into exhaust manifold. Can't see if in converter, because shield, just concern when run erratic on cold start for 10 or more seconds because crack in manifold. Until metal hot expand an run normal that could damage valves. Or screw up timing, if goes out time. Ur motor is toast, the shop Say shouldn't do nothing motor, but exhaust in cab is not what want. I pretty sure at times, at idle an park few min or cold start , smell exhaust. , It been that way the same since first year, just wondering if thst rough idle at first until metal expand an stop leak an run right , if rough idle could screw up motor ? I believe my old truck did same thing crack manifold except worse. , Until welded.the cost an cast iron manifold ridiculous, at gm garage, it be over $1500, was bad gm design, evaporater drip water manifold weaken,

A rough idle because of a weird oxygen sensor reading should not damage your motor that way. It may cause your spark pugs to foul, your converter to plug, poor fuel economy or a loss of power.

Exhaust in the cab is bad, exhaust gas is deadly.

Colorado's were not a shining example of GM (Isuzu) engineering.

Didnt know you rode a bicycle walleyed.
Or are you one of those democrat "do as I say,not as I do" types.

IF you can get at it, take it to a welder. It can be welded with either a spray welder or a high nickel rod like a 307.
Be me, if I couldn't weld it without taking it off, I wouldn't worry one tenth what you are about it.

I have a wrapped exhaust manifold On my F-150 It sounds pretty neat but It runs just fine. They want to $500.00 bucks to replace it. I think I'll leave It the way It Is.

Not true, great for Exhaust manifolds, first thing on the list....

Use your tax refunds to get it did.

Not true, great for Exhaust manifolds, first thing on the list....



[/quote]
This-- like ADC said and I said. The stuff I used from Auto Zone reminded me of valve lapping compound. Patched up a small hole in my manifold for a couple years before I replaced it.

If can see the crack I could try it if can be patched. I heard with this problem that always cracks where converter is integrated or molded on to manifold an 3 shops I ask in past. Say it could not be welded or repaired , I don't know. ? Take off heat shield an got unhook wire go to o2 sensor , however that unhooks an could take a look at it , the converter is no good. The check engine lite on over a year now, an had code scan more once

Yep, you'll have to take heat shield off.

As for the check engine light, yes again because it's sucking air in thru the crack giving false readings.

For once, take some of the above advise and either.....

Patch it with the J B weld recommended

Take to good welder

Or forget about it!

Well I think about it over weekend an decide next week, what do , could ask shop if JB welded compound maybe work, I think not an blow again or worse an blow out big crack , I don't know, the conveter went bad like 15 mi the ago an check engine lite in since then, the crack happen in January, so until replaced. No check engine lite to see if anything else wrong, it sound normal or nearly normal after warm up good, but for 15-20 seconds, the rough idle on cold start. An noise. , Back pressure not right ? Scary, I shudder an think it go wreck engine sometime. It go away after 20 seconds an on road after few miles. Normal or almost. Maybe should consider blow about $1k on cast iron exhaust manifold with converter integrated on it, expensive an go hurt, 2nd replace manifold. U can get for around $400 in first auto parts, advance auto want $600 for cheaper one, I doubt the shop is go want to put one on i get, I believe they quoted. $700 , Chevy garage or dealer. Is way over $1500, they only get gm replacement parts, have save up bunch $$ just lately in last 2 months, but it gonna be expensive, anyone know on hi mileage vechiles if oil pump fails , when do they usally not work right ? Upon engine start ? I almost positive the rough idle at cold start for 20 seconds , is back pressure from crack manifold, I had motor in another pickup years ago that died,, oil pump fail, is oil pump failure a common reason hi mileage vechiles die ? When do they fail ? Cold start act up ? I have 218, k on engine. Uses maybe a quart an half oil in 3k miles. Between oil change

coonman If you are serious about replacing the part try rockauto.com.

Not something wanna try myself. I doubt any shops let u bring ur part in, was asking anyone knows about motors with lots miles an oil pump failure

Drive it around at night here in Iowa, maybe a deer will wander into your path and solve its problems. There are mechanics around where you supply the parts and pay them to put it on.

I do it all the time with our mechanic. My old f150 has a little diesel in it that doesnt belong in there and most shops won't touch it. The small, one man mechanic shops will usually work with you on parts.

Drive it off a dock into the river,or burn it back in the bush then report it stolen and collect the insurance.

I don't have full coverage on it. Not a 2010 with high miles. If ur financed. I believe law say u have to or get financed, dealer wont sell. At least when bought it new. I not into ins fraud an big trouble. They only pay u what worth. I believe u also got have gap ins. When get something cost a lot or new from vechile. It pay difference. Between ins pay off. An what u owe on finacing, there all sorts junk I rember try sell u when bought new, extended warranty. Auto armor or ins even on interior an paint? Undercoating, other rip off crap they add onto ur financing , when I bought new in 2010, I argue lot on price an only thing got was gap ins. Expensive enough. Then they screw u on trade in price. There were $1000 off in discounts am noone wants manual. Difference in price. I believe the sale price after incentives was $19,000, now check out new Colorado prices. That 4 by 4, depreciation is terrible an quick when have for short while. Like $1000s, u got pay freight ft factory even if already have lot which they did. I could look up. Like $6$-700 more, unless u got money buy new vechile. U get screw bad on finacing, the first new vechile I actually pay off, without trade in, like keep it, I am picky with it an what do it, an who give ride to, I heard someone give some girl ride an had dope. I thought was dirty. As he had nothing do it an cops impound it an confiscate an sold sheriff auction I hear. I guess they like it that own it in such a case az if financed. It go back finance company, here the law sold it at profit to county. An this guy didn't have thing do it an got charged, but anyhow this don't matter, as wondering bfore get manifold replaced. Az oil pump symptoms or failures, ? These shops where they install ur parts, almost got be like guy that works cars. U csn trust. I know none , just shops, midas muffler wanted. Around $1200, shop I thinking of, maybe $900

I know not everyone is a mechanic, or even close to one.

That said, you can at least try to remove the heat shield and smear some goop on it surely? It's not like your going to ruin the manifold so you have nothing to lose.

Fix one problem then go on and worry about the "what ifs". You can have the shield off shortly if you'd just try.

Deja vu

veja du

For sure

Coonman is going to get 10 or 11 more opinions from dealers that say nothing can be done but a replacement. I was going to copy and paste an interesting sentence to answer of his but couldn't find any periods.

There's nothing wrong with the truck he has, so the manifold is cracked, big deal, it doesn't effect the way it gets down the road and isn't going to hurt anything else. He doesn't think the JB Weld will work because the same shop that he doesn't trust with their diagnosis told him so. An oil pump either works or it doesn't.

Just drive the thing and IF it ACTUALLY breaks down then have it fixed.

You're going to die young if you don't get some help with your anxiety dave. Your constant worry and feeling that everyone is out to get you is not normal and is very unhealthy. I consider you a buddy and only say this because I care about it.

You recall when my wife took this picture of you? I treated you pretty good that day I'd say. I don't just go around doing that for just everyone.

Thanks ADC
Far from the mental image I had.

I pictured a tall, lanky skinny guy hunched over with dickies work uniform on...….

Ha. It's funny the mental images we create of people we've never met. I'm always wayyyy off, lol.

my god,one legs 4 in longer than the other,no wonder it don't run right.

"Daves not here man."

At least he drinks water. I think he would be fun to have at a trappers convention.

campfire with coonman at the NTA,we'll pay off his taxes and get him a new truck on admission fees alone.

The guy in the picture doesn't look anything like the coonman I see in my "Mind's Eye".

The coonman I pictured is 6' 4" and 165 pounds,

Bald as a cue-ball with bugged out eyes,

and walks with a hitch in his get-a-long.

Who is this imposter ?

w

His name should be "coolman" not coonman.

So when motor run rough on cold start for 20 seconds until warmup an crack expand from heat an seal leak, is that running rough , consider a misfire ?

BOHICA !!!!!

Well the exhaust manifold just went. After work start. Sound slightly different. Then went up lil hill an loud, next time start , well be shop, I just hope I can start an get shop , with not lot backpressure, because crack, it was not do good performance. Go up driveway. Can u damage engine with not right amount backpressure from crack manifold. Until warm up an slight seal metsl ftom heat by crack ? I concerned. On cold start. That go run resl rough until warm, it did good at 70 mph warm up but slow speed. An cold start to shop, I don't know

Get a buddy to tow you to the shop. To be on the safe side.

I have noone. Ins. Then trouble get there, I ask shop see say, not have good day

That sucks you don’t have someone that would tow you...

Go ahead and call the shop and ask if it is ok to drive to the shop...

I hope you get it fixed up and running...

coonman, if you go to the "Search" feature of trapperman at the top of the main forums and type in "trapping vechile" in the search you will find exactly 20 threads you have made with this same title over the past few years (and that's just with your erroneous spelling of vehicle). Who knows how many search results you might yield with alternative spellings. Perhaps if you dig through YOUR OWN archives you'll find the answer you're looking for.

Everyone needs a hobby.

Got manufold cat assembly replace today, good had it towed. Crack huge an say comeout Piecez, $815, I left old cat manifold lay. I dont know shop let u keep? I just rember. Are old cat cast iron manifold, the old junk cat worth anything with platinum ? I heard, ppl steal them off cars.

she'll have so much power now you'll have to use the e brake ta hold er back.

glad ya got it fixed Dave.

Definately noise. From new cat manifold area. Not real loud an hard describe. Not sure if normal , gonna ask shop guy listen to it , when change coolant next week , hope not exhaust valves or damage by cracked manifolld, run an idle good, how tell if damaged exhaust valves or stems ?

It didn't damage your valves, the "back pressure" you worry about is a myth.

I think your truck should run good now.

The noise is coming from new converter manifold, weather normal , not sure, or maybe kinda noise that aftermarket one makes, it under warranty, runs good

you need to get yourself some earplugs Dave.

or find a good country station and turn the volume up

I wear ear plugs.

Geeze Run, It's not a truck..........It's a vechile !!!!

Everybody knows that !!!!

w