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Oct 10, 2018 | 11:21 PM

Majik1

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Help ---- Help

Hi Tadge, and all,
I have a problem with my 1988 Corvette, put in new fuel pump, new filter, new MAF sensor, starts right up, run great for 2 minutes, then I get a "roar" from the intake and it will not run, shut it off and it starts, but only the "roar" when stepping down on the accelerator, no codes and nothing from the code connector, (an y readings, blank)

Oct 11, 2018 | 01:29 PM

ls777z

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Joined: Nov 2015

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From: Clay New York

a HUGE vacumn leak ???

Oct 11, 2018 | 01:56 PM

Majik1

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Thank you Is777z,
I will check it out, I did put in new vacuum lines, couldn't remember al the connections. Maybe something connected wrong ???
Majik1

Oct 11, 2018 | 03:26 PM

65Z01

Team Owner

Joined: Dec 2000

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From: SE NY

Cruise-In II Veteran

A manifold vac. gauge is often very helpful along with a variety of vac. lines and connectors.

Oct 11, 2018 | 05:50 PM

playsdixie

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Joined: Jun 2013

Posts: 1,590

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From: ft myers FL/Munising MI

Quote:

Originally Posted by Majik1

Thank you Is777z,
I will check it out, I did put in new vacuum lines, couldn't remember al the connections. Maybe something connected wrong ???
Majik1

Maybe??????.....

by the way, welcome to the forum.....

Last edited by playsdixie; Oct 11, 2018 at 05:51 PM.

Oct 11, 2018 | 08:03 PM

JBPC4

Racer

Joined: May 2018

Posts: 350

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You mentioned replacing the maf, check the intake connections around that and the throttle body, especially on the underside where it’s hard to see. It’s easy for the rubber hose to get caught up on the bottom of the throttle body and not seal properly, which would cause a huge vacuum leak of unmetered air coming in after the maf. That would also explain why it runs fine for the first few minutes while it’s still in open loop mode, then when it switches to closed loop it runs like poop.

Oct 11, 2018 | 10:29 PM

Majik1

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Hi 65Z01,
Thank you, I will see what I can do, never had this problem with ANY car over the years. That is why I am so stumped !!!

Oct 11, 2018 | 10:32 PM

Majik1

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Hi JBPC4,
This is the second MAF I have put on, the "air pump" by the A/C does click a lot. Don't know any thing about that, Once again thank you for your help, it is well appreciated !!!
Majik1

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Oct 12, 2018 | 08:00 AM

playsdixie

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From: ft myers FL/Munising MI

If you can't find on the basis of the sound you described, try spraying some throttle body cleaner around the lines....the rpm's will pick up when your spray finds the leak.....it takes more that a couple minutes to go into closed loop ..good luck..no smoking during this test...

Oct 12, 2018 | 01:29 PM

#10

Majik1

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Hi playsdixie,
Thank you for the info, tried that, also disconnected all lines, (blocked them) and put them back on one at a time, same problem.
Majik1

Oct 12, 2018 | 07:10 PM

#11

ghoastrider1

Le Mans Master

Joined: May 2006

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From: indy indiana

ihis may sound dumb, but dod u put the fuel filter arrows going in the correct direction?

Last edited by ghoastrider1; Oct 12, 2018 at 07:11 PM.

Oct 12, 2018 | 08:37 PM

#12

Majik1

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Hi ghoastrider1,
Thank you, that is not dumb, I really need to check that, but, it runs great for 2 minutes, then I step on the gas and all it does is roar, (all air, no gas).
Majik1