Life Mechanic help needed asap..please. - Page 2

Dottefan · 12-20-2009, 06:41 PM

Over the past couple of weeks my truck has started to backfire. I have a 98 2 door tahoe with a 5.7 liter vortec. Well Today, along with the master cylinder I went ahead and replaced the spark plugs and wires, and fuel regulator...but it still keeps back firing. It happens mostly when I take my foot of the gas, it starts to do it very rapidly, and its Idling ruff.. when I have my foot on the gas, it doesn't do it that much..it also acts like it wants to die on me every so often..I`m dropping it off at the shop tomorrow, not sure whats up with it..I `m thinking the compression is off, or the fuel pump..I also noticed that I had a hole in my muffler, while I was bleeding the breaks maybe thats the reason? I dont know...and Ideas ?

Dottefan · 12-20-2009, 08:02 PM

Quote:

Originally Posted by Gonzo

Those engines, (while great) are notorious for having the valve guide seals leak and go tits up. It doesn't sound like this is the case here but some of the symptoms are consistent. When you start it up, does blue smoke come out of the exhaust?
Posted via Mobile Device

No..I looked for that also.

**Gonzo** · 12-20-2009, 08:07 PM

Quote:

Originally Posted by Dottefan

No..I looked for that also.

Well shit....

I'm thinking you have an ignition problem then. Likely a bad coil pack/distributor or your timing is screwed.
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PastorMikH · 12-20-2009, 08:18 PM

Quote:

Originally Posted by Brock

...Sounds more like timing.

ditto

I'm wondering if the timing chain jumped a tooth or two.

Brock · 12-20-2009, 08:19 PM

Quote:

Originally Posted by PastorMikH

ditto

I'm wondering if the timing chain jumped a tooth or two.

I'm thinking more along the lines of it's not really out of time, but the 'puter thinks it is because of a haywire sensor or something.

Dottefan · 12-20-2009, 08:21 PM

Quote:

Originally Posted by Gonzo

Well shit....

I'm thinking you have an ignition problem then. Likely a bad coil pack/distributor or your timing is screwed.
Posted via Mobile Device

Do you know how expensive that might be if its the timing? or a bad coil pack?

Brock · 12-20-2009, 08:23 PM

Quote:

Originally Posted by Dottefan

Do you know how expensive that might be if its the timing? or a bad coil pack?

My suggestion is to go to autozone and get a code reading. (free) They'll tell you what the code means and what parts are likely to be bad, and how much those parts cost.

Dottefan · 12-20-2009, 08:23 PM

Quote:

Originally Posted by Brock

I'm thinking more along the lines of it's not really out of time, but the 'puter thinks it is because of a haywire sensor or something.

I`m thinking the same thing...or at least my pockets are hoping its just that lol.

Dottefan · 12-20-2009, 08:24 PM

Quote:

Originally Posted by Brock

My suggestion is to go to autozone and get a code reading. (free) They'll tell you what the code means and what parts are likely to be bad, and how much those parts cost.

First thing in the morning..thanks. I`m going to get some Yellow Jacket? or what ever its called also. Thanks for all the help fellas, greatly appreciated..

**Bwana** · 12-20-2009, 08:55 PM

Quote:

Originally Posted by Dottefan

First thing in the morning..thanks. I`m going to get some Yellow Jacket? or what ever its called also. Thanks for all the help fellas, greatly appreciated..

Heat in the yellow bottle.

**IA_Chiefs_fan** · 12-20-2009, 09:35 PM

I would get the compression checked before you spend too much money on all the little things. Also a leak down test might be in order. Good luck either way.

Dottefan · 12-21-2009, 04:29 PM

UPDATE.. Took my car to autozone this morning..10 codes popped up in the computer.lol..dropped it off at the shop today..Intake gasket was bad, and I had a vacum leak...total bill was $311.06..after dropping $225.00 the day before on tune up, brakes and fuel regulator..oh well, my truck should run like a champ..if I can afford gas this week lol.

Extra Point · 12-21-2009, 04:38 PM

Quote:

Originally Posted by Dottefan

UPDATE.. Took my car to autozone this morning..10 codes popped up in the computer.lol..dropped it off at the shop today..Intake gasket was bad, and I had a vacum leak...total bill was $311.06..after dropping $225.00 the day before on tune up, brakes and fuel regulator..oh well, my truck should run like a champ..if I can afford gas this week lol.

Good for you! My bro's 98 Dakota was coughing and not wanting to keep running. Had to replace a cracked vacuum boot off the intake, and that was that!

Glad you're good to go. That old horse is worth it. Hopefully, it will keep you on the road for a good while.

**Bwana** · 12-21-2009, 04:43 PM

Quote:

Originally Posted by Dottefan

UPDATE.. Took my car to autozone this morning..10 codes popped up in the computer.lol..dropped it off at the shop today..Intake gasket was bad, and I had a vacum leak...total bill was $311.06..after dropping $225.00 the day before on tune up, brakes and fuel regulator..oh well, my truck should run like a champ..if I can afford gas this week lol.

Tisk tisk, that was one of the things I told you to look for no? Hey, at least your outfit should run like a champ now.

**SAUTO** · 12-21-2009, 05:11 PM

Quote:

Originally Posted by Bwana

Tisk tisk, that was one of the things I told you to look for no? Hey, at least your outfit should run like a champ now.

i came on here because i got the same unit with the intake gasket leaking and the upper plenum o ring around the injector plug in leaking vacuum. ran just like what you described. and that a pretty good price dotte

12-21-2009, 05:18 PM

Quote:

Originally Posted by Simply Red

yep, had that issue before with a Nissan 240 yrs ago. Yes to Yellow Heat.

I don't believe Nissan has been around that long.

12-20-2009, 06:41 PM
Dottefan Banned Join Date: Apr 2009 Location: FROM KCK, LIVIN N J\O Casino cash: $10004900	Mechanic help needed asap..please. Over the past couple of weeks my truck has started to backfire. I have a 98 2 door tahoe with a 5.7 liter vortec. Well Today, along with the master cylinder I went ahead and replaced the spark plugs and wires, and fuel regulator...but it still keeps back firing. It happens mostly when I take my foot of the gas, it starts to do it very rapidly, and its Idling ruff.. when I have my foot on the gas, it doesn't do it that much..it also acts like it wants to die on me every so often..I`m dropping it off at the shop tomorrow, not sure whats up with it..I `m thinking the compression is off, or the fuel pump..I also noticed that I had a hole in my muffler, while I was bleeding the breaks maybe thats the reason? I dont know...and Ideas ?
Posts: 1,295

12-20-2009, 09:35 PM	#25
IA_Chiefs_fan Supporter Join Date: Jun 2002 Casino cash: $-740286	I would get the compression checked before you spend too much money on all the little things. Also a leak down test might be in order. Good luck either way.
Posts: 2,101

12-21-2009, 04:29 PM	#26
Dottefan Banned Join Date: Apr 2009 Location: FROM KCK, LIVIN N J\O Casino cash: $10004900	UPDATE.. Took my car to autozone this morning..10 codes popped up in the computer.lol..dropped it off at the shop today..Intake gasket was bad, and I had a vacum leak...total bill was $311.06..after dropping $225.00 the day before on tune up, brakes and fuel regulator..oh well, my truck should run like a champ..if I can afford gas this week lol.
Posts: 1,295