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Feb 23, 2005 | 11:00 PM

C3Muscle352

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headlights...

i just installed headers on my 78 vette and now the headlights dont come up anymore. what happened? i know they work on a vaccum from the exhaust but i dont know how to get them back working ..... any tips?

Feb 23, 2005 | 11:03 PM

Stoge

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From: Fair Oaks, OK

Actually, they work on vaccuum from your intake. Sounds to me like you broke a fitting or otherwise didn't get a hose back on correctly.

Feb 23, 2005 | 11:54 PM

goinbroke

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From: Texas

I'll be interested what kind of replies you get on this since I went through a similar situation a couple of years ago. I went from stock exhaust (74) to 2 1/2" pipes, flowmasters, and an H pipe....no headers. I quickly noticed that my lights went from slow to really really slow. I always guessed that my engine vacuum (somehow) changed due to the free flowing system. I knew my headlight relays were marginal and after a rebuild everything worked ok. I never could get an opinion on whether freeing up the exhaust system could cause a vacuum change.

Last edited by goinbroke; Feb 23, 2005 at 11:57 PM.

Feb 24, 2005 | 12:05 AM

C3Muscle352

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Intake ah, i must check that over then.

Feb 24, 2005 | 01:55 AM

BigBlockk

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From: North Bend Ohio

I would think freeing up the exhaust would give more vacuum. You have pinched a vacuum line or you hooked them back up wrong.

BigBlockk

Later.....

Feb 24, 2005 | 09:59 AM

C3Muscle352

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Quote:

Originally Posted by Stoge

Actually, they work on vaccuum from your intake. Sounds to me like you broke a fitting or otherwise didn't get a hose back on correctly.

I found the problem, it was just a forgotton hose on the back on the intake manifold. Thanks stoge i was looking in the wrong place the whole time. Finally i got enough sense to trace the lines back to where they originate. and Presto, up the lights come. slower than before but ill take some added HP over slow lights anyday! .