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will a backfire blow a head gasket by fierofinder
Started on: 08-28-2014 08:23 PM
Replies: 6 (585 views)
Last post by: dratts on 08-29-2014 07:11 PM
fierofinder
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Report this Post08-28-2014 08:23 PM Click Here to See the Profile for fierofinderClick Here to Email fierofinderSend a Private Message to fierofinderEdit/Delete MessageReply w/QuoteDirect Link to This Post
Like the title says I was curious if a strong back fire might blow a good head gasket. on initial start up I had a couple plug wires backwards and so I got a pretty loud backfire. When I pulled the themostat cap off the coolant was foamy at the top and while it was running the exhaust did seem a little white. Havent had time to do compression check yet to be sure but it worries me. Its a freshly built engine.
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fieroaddicted
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Report this Post08-28-2014 08:28 PM Click Here to See the Profile for fieroaddictedClick Here to Email fieroaddictedSend a Private Message to fieroaddictedEdit/Delete MessageReply w/QuoteDirect Link to This Post
Is it a 4cyl? 2.8? Is it possible you have a head gasket on wrong since this is rebuilt?
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fierofinder
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Report this Post08-28-2014 08:49 PM Click Here to See the Profile for fierofinderClick Here to Email fierofinderSend a Private Message to fierofinderEdit/Delete MessageReply w/QuoteDirect Link to This Post
Its a 3.4 I had running for awhile in the past and put about 1000 miles on it.
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fierofinder
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Report this Post08-29-2014 12:45 PM Click Here to See the Profile for fierofinderClick Here to Email fierofinderSend a Private Message to fierofinderEdit/Delete MessageReply w/QuoteDirect Link to This Post
checked compression this morning and that is all good. Probably just got foamy from the air in the system.
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fieroaddicted
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Report this Post08-29-2014 02:06 PM Click Here to See the Profile for fieroaddictedClick Here to Email fieroaddictedSend a Private Message to fieroaddictedEdit/Delete MessageReply w/QuoteDirect Link to This Post
If possible, i would do a leakdown test. It is your best indicator of any issue. If there was a problem with a gasket, you would see bubbles in the cooling system
troy
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Gall757
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Report this Post08-29-2014 02:40 PM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
A direct answer to your headline question is 'NO'. A backfire is heard when fuel ignites with the exhaust ( or intake ) valve open....or ignition outside of the combustion chamber. In both cases the peak pressure will be a LOT lower than normal ignition.....with the valves closed.

[This message has been edited by Gall757 (edited 08-29-2014).]

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dratts
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Report this Post08-29-2014 07:11 PM Click Here to See the Profile for drattsClick Here to Email drattsSend a Private Message to drattsEdit/Delete MessageReply w/QuoteDirect Link to This Post
It can open a muffler up though.
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