 vacuum issue, won't run, mechanic needs help |
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| enf2232 |
 Apr 1 2024, 12:56 PM
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Member  Group: Members Posts: 86 Joined: 13-July 14 From: Toledo, OH Member No.: 17,621 Region Association: None  |
Background: 1.7 liter which has been upgraded with new pistons and cylinders, original fuel injection. Car started and ran, then stalled and would not restart. Covid hit so it sat for a while. Now at mechanics shop where they have replaced the fuel pump (rebuilt original) and the manifold pressure sensor (rebuilt).
Engine has low manifold vacuum, 10-12" and will not start. If they apply 15-18" of vacuum with a vacuum pump it starts right up and will run fine for 20-30 minutes (on pump), then stalls. If they attempt to restart, it backfires and will not restart until cold. Any suggestions on what to check or what next step should be? |
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Replies
| dr914@autoatlanta.com |
Apr 2 2024, 09:01 AM
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#2
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914 Guru Group: Members Posts: 7,887 Joined: 3-January 07 From: atlanta georgia Member No.: 7,418 Region Association: None |
need more info, if your mechanic cannot figure it out, have him call me, they all do
QUOTE(enf2232 @ Apr 1 2024, 11:56 AM)  Background: 1.7 liter which has been upgraded with new pistons and cylinders, original fuel injection. Car started and ran, then stalled and would not restart. Covid hit so it sat for a while. Now at mechanics shop where they have replaced the fuel pump (rebuilt original) and the manifold pressure sensor (rebuilt). Engine has low manifold vacuum, 10-12" and will not start. If they apply 15-18" of vacuum with a vacuum pump it starts right up and will run fine for 20-30 minutes (on pump), then stalls. If they attempt to restart, it backfires and will not restart until cold. Any suggestions on what to check or what next step should be? |
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Posts in this topic
enf2232 vacuum issue, won't run Apr 1 2024, 12:56 PM
ctc911ctc 1) All High Pressure hoses (the ones on the plenum... Apr 1 2024, 01:23 PM 76-914 Do as previous post suggested and have mechanic do... Apr 1 2024, 03:09 PM r_towle Start with a compression test.
If you pass that te... Apr 1 2024, 04:46 PM
Superhawk996
Stop throwing parts at it.
:agree:
I’d fir... Apr 1 2024, 05:27 PM emerygt350 Compression first... Apr 1 2024, 05:40 PM Ishley What year? Which ECU? Apr 1 2024, 06:20 PM enf2232 To respond and answer some questions. We are not ... Apr 1 2024, 06:46 PM r_towle I agree with Superhawk above
Send this link to the... Apr 1 2024, 07:01 PM Superhawk996 Here’s the resistance vs ambient curve for the v... Apr 2 2024, 07:05 AM McMark I agree with Superhawk996. Vacuum is higher at idl... Apr 2 2024, 07:11 AM 76-914
I agree with Superhawk996. Vacuum is higher at id... Apr 2 2024, 07:22 AM McMark nope Apr 2 2024, 07:34 AM emerygt350 Thats pretty low manifold pressure but intensely r... Apr 2 2024, 07:48 AM Dave_Darling Check the ignition system first, then make sure th... Apr 3 2024, 11:40 PM |
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