91 injector leak test
Thread Starter
Instructor
Joined: Jan 2005
Posts: 145
Likes: 0
From: Ft.Worth Texas
91 injector leak test
What is the mininum psi leak down on a 91 ? and can somene tell me what ford injectors are the best for a 91? bought some used blue tops off ebay,are leaking by.Should buy new I guess.Thanks for any help.
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
Usually all drops should be within 10% of one another so if one drops rail pressure 15 psi none of the others should drop more than 1.5 psi less. Difficult to measure with most Pressure Gages as the increments are too close together to get an accurate measurement (at least for my 55 year old eyes!). You also need something to energize each injector for a milisecond and NAPA does carry such a tool for about $80 (I actually bought one 5 or 6 years ago and though it was fun to play with it, it's probably better to let someone with a bench to flowtest them). If Rich at Crusin Performance is still around, maybe someone can provide his web. Otherwise, Street & Performance - www.hotrodlane.cc - provides a similar service - flow testing, blueprinting and reconditioning for a decent price.
Team Owner
Joined: Jan 2003
Posts: 20,301
Likes: 240
From: Summerland B.C. Canada
Are you basing this on fuel pressure dropping ?? Have you pinched off the fuel lines to see if it is the check valve in pump or regulator ??
https://www.corvetteforum.com/techti...=192&TopicID=2
https://www.corvetteforum.com/techti...=192&TopicID=2
