2.8L starting issues

86rollin · 02-02-2010, 05:57 PM

hey my 2.8L backfires out of the throttlebody when i crank it over could it be the O-ring under my distributer? plz help

neo71665 · 02-02-2010, 07:53 PM

I would check the timing first, sounds like the distributor isn't in right. A bad o-ring under the dizzy will only make it leak oil like crazy and has no effect on the engine running (unless you run it out of oil).

86rollin · 02-02-2010, 08:26 PM

i have fresh oil in it i had to pull my motor almost comletely to change my oilpan gasket ive put #1 cylender at dead top making my dizzy pointing at #1 but it still does the same thing

1989redneks10 · 02-02-2010, 09:34 PM

does it ever start and run? or does it just backfire?

neo71665 · 02-02-2010, 10:23 PM

Are you sure your calling the correct cylinder #1? Did you pull the dizzy? Are you sure its not pointing at #4 when it should be at #1 (sounds like the case to me)

86rollin · 02-03-2010, 12:28 AM

well i was wron the gasket is inder the cap and i think its letting air in.. could that be the problem?

1989redneks10 · 02-03-2010, 05:22 AM

no that shouldn't hurt anything. I agree with neo71665 either you got in on # 4 or a plug wire is crossed somewhere.

86rollin · 02-03-2010, 09:02 PM

well ive hooked everything up according to chiltons and the cables are correctly hooked up i just need a 4.3L

neo71665 · 02-03-2010, 09:04 PM

Did you take the timing chain off for any reason?

Same problems can happen with a 4.3. Hell I worked on a 350 the other day that somebody had plug wires crossed.

86rollin · 02-04-2010, 12:54 AM

yea i know but my truck has 170k miles on it she need it

1989redneks10 · 02-04-2010, 06:02 AM

man that 2.8 will go way past 170k easy...

86rollin · 02-04-2010, 06:25 PM

no i didnt touch the timing chain

Rebel_US · 02-04-2010, 10:17 PM

Their pushing on TIMING as an issue due to the backfire.

The things supposed to fire when the valves are both closed and the cylinder is up. Backfiring thru the TBI means a valve is open (intake) and you get a plug firing.

What did you touch prior to this or did it just start doing it?

I'm with everyone else: plug wires or dizzy.

86rollin · 02-05-2010, 01:17 AM

alright guys ill have to get someone over here to time it then ill let you know whats up hit me up kasynehls@yahoo.com

86rollin · 02-08-2010, 08:39 PM

hey thanks for all your help i dicovered it was my dizzy i was 180 out in it thanks again for all your help

02-02-2010, 05:57 PM	#1
86rollin Registered User Age: 20 Join Date: Feb 2010 Posts: 14 Location: User is: OffLine	2.8L starting issues hey my 2.8L backfires out of the throttlebody when i crank it over could it be the O-ring under my distributer? plz help
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02-02-2010, 07:53 PM	#2
neo71665 4x4 v6 blazer Age: 30 Join Date: Oct 2004 Posts: 5,339 Location: rison arkansas User is: OffLine	Re: 2.8L starting issues I would check the timing first, sounds like the distributor isn't in right. A bad o-ring under the dizzy will only make it leak oil like crazy and has no effect on the engine running (unless you run it out of oil).
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02-02-2010, 08:26 PM	#3
86rollin Registered User Age: 20 Join Date: Feb 2010 Posts: 14 Location: User is: OffLine	Re: 2.8L starting issues i have fresh oil in it i had to pull my motor almost comletely to change my oilpan gasket ive put #1 cylender at dead top making my dizzy pointing at #1 but it still does the same thing
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02-02-2010, 09:34 PM	#4
1989redneks10 Registered User Age: 24 Join Date: Jan 2010 Posts: 82 Location: sonora, ky User is: OffLine	Re: 2.8L starting issues does it ever start and run? or does it just backfire?
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02-02-2010, 10:23 PM	#5
neo71665 4x4 v6 blazer Age: 30 Join Date: Oct 2004 Posts: 5,339 Location: rison arkansas User is: OffLine	Re: 2.8L starting issues Are you sure your calling the correct cylinder #1? Did you pull the dizzy? Are you sure its not pointing at #4 when it should be at #1 (sounds like the case to me)
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02-03-2010, 12:28 AM	#6
86rollin Registered User Age: 20 Join Date: Feb 2010 Posts: 14 Location: User is: OffLine	Re: 2.8L starting issues well i was wron the gasket is inder the cap and i think its letting air in.. could that be the problem? Last edited by 86rollin : 02-03-2010 at 12:28 AM. Reason: add on
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02-03-2010, 05:22 AM	#7
1989redneks10 Registered User Age: 24 Join Date: Jan 2010 Posts: 82 Location: sonora, ky User is: OffLine	Re: 2.8L starting issues no that shouldn't hurt anything. I agree with neo71665 either you got in on # 4 or a plug wire is crossed somewhere.
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02-03-2010, 09:02 PM	#8
86rollin Registered User Age: 20 Join Date: Feb 2010 Posts: 14 Location: User is: OffLine	Re: 2.8L starting issues well ive hooked everything up according to chiltons and the cables are correctly hooked up i just need a 4.3L
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02-03-2010, 09:04 PM	#9
neo71665 4x4 v6 blazer Age: 30 Join Date: Oct 2004 Posts: 5,339 Location: rison arkansas User is: OffLine	Re: 2.8L starting issues Did you take the timing chain off for any reason? Same problems can happen with a 4.3. Hell I worked on a 350 the other day that somebody had plug wires crossed.
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02-04-2010, 12:54 AM	#10
86rollin Registered User Age: 20 Join Date: Feb 2010 Posts: 14 Location: User is: OffLine	Re: 2.8L starting issues yea i know but my truck has 170k miles on it she need it
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02-04-2010, 06:02 AM	#11
1989redneks10 Registered User Age: 24 Join Date: Jan 2010 Posts: 82 Location: sonora, ky User is: OffLine	Re: 2.8L starting issues man that 2.8 will go way past 170k easy...
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02-04-2010, 06:25 PM	#12
86rollin Registered User Age: 20 Join Date: Feb 2010 Posts: 14 Location: User is: OffLine	Re: 2.8L starting issues no i didnt touch the timing chain
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02-04-2010, 10:17 PM	#13
Rebel_US Registered User Age: 48 Join Date: May 2009 Posts: 337 Location: Gulf Coast - AL User is: OffLine	Re: 2.8L starting issues Their pushing on TIMING as an issue due to the backfire. The things supposed to fire when the valves are both closed and the cylinder is up. Backfiring thru the TBI means a valve is open (intake) and you get a plug firing. What did you touch prior to this or did it just start doing it? I'm with everyone else: plug wires or dizzy.
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02-05-2010, 01:17 AM	#14
86rollin Registered User Age: 20 Join Date: Feb 2010 Posts: 14 Location: User is: OffLine	Re: 2.8L starting issues alright guys ill have to get someone over here to time it then ill let you know whats up hit me up kasynehls@yahoo.com
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02-08-2010, 08:39 PM	#15
86rollin Registered User Age: 20 Join Date: Feb 2010 Posts: 14 Location: User is: OffLine	Re: 2.8L starting issues hey thanks for all your help i dicovered it was my dizzy i was 180 out in it thanks again for all your help
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