maybe a reason for idle problem
Thread Starter
Drifting
Joined: Dec 2012
Posts: 1,504
Likes: 73
From: Georgetown TX
maybe a reason for idle problem
1989 stock with auto transmission
found this. Interesting read if you have bad idle and can’t find reason why. It’s only only part of article. When I’m through being sick I’m going to check mine
Power booster breaks down eventually - especially if your brake master cylinder is leaky and deposits brake fluid in the booster body. When the diaphragm finally rips or develops a hole, you lose the vacuum boost to your braking, but there's also a more insidious problem - when the diaphragm no longer holds vacuum, every time you step on your brakes you're allowing air to rush into your intake manifold, changing the fuel-air mixture your engine needs. What's worse is that in Chevy small blockdesigns, all the vacuum used by the brake booster is drawn from the #1 cylinder runner. This means that every time you step on the brakes, you're creating a super-lean running condition in that cylinder, and that will shortly lead to detonation (pinging) and potentially damage to the #1 cylinder that will require an engine rebuild or replacement.
found this. Interesting read if you have bad idle and can’t find reason why. It’s only only part of article. When I’m through being sick I’m going to check mine
Power booster breaks down eventually - especially if your brake master cylinder is leaky and deposits brake fluid in the booster body. When the diaphragm finally rips or develops a hole, you lose the vacuum boost to your braking, but there's also a more insidious problem - when the diaphragm no longer holds vacuum, every time you step on your brakes you're allowing air to rush into your intake manifold, changing the fuel-air mixture your engine needs. What's worse is that in Chevy small blockdesigns, all the vacuum used by the brake booster is drawn from the #1 cylinder runner. This means that every time you step on the brakes, you're creating a super-lean running condition in that cylinder, and that will shortly lead to detonation (pinging) and potentially damage to the #1 cylinder that will require an engine rebuild or replacement.
Safety Car
Joined: Aug 2009
Posts: 3,752
Likes: 278
From: Melbourne, Victoria, Australia
1989 stock with auto transmission
found this. Interesting read if you have bad idle and can’t find reason why. It’s only only part of article. When I’m through being sick I’m going to check mine
Power booster breaks down eventually - especially if your brake master cylinder is leaky and deposits brake fluid in the booster body. When the diaphragm finally rips or develops a hole, you lose the vacuum boost to your braking, but there's also a more insidious problem - when the diaphragm no longer holds vacuum, every time you step on your brakes you're allowing air to rush into your intake manifold, changing the fuel-air mixture your engine needs. What's worse is that in Chevy small blockdesigns, all the vacuum used by the brake booster is drawn from the #1 cylinder runner. This means that every time you step on the brakes, you're creating a super-lean running condition in that cylinder, and that will shortly lead to detonation (pinging) and potentially damage to the #1 cylinder that will require an engine rebuild or replacement.
found this. Interesting read if you have bad idle and can’t find reason why. It’s only only part of article. When I’m through being sick I’m going to check mine
Power booster breaks down eventually - especially if your brake master cylinder is leaky and deposits brake fluid in the booster body. When the diaphragm finally rips or develops a hole, you lose the vacuum boost to your braking, but there's also a more insidious problem - when the diaphragm no longer holds vacuum, every time you step on your brakes you're allowing air to rush into your intake manifold, changing the fuel-air mixture your engine needs. What's worse is that in Chevy small blockdesigns, all the vacuum used by the brake booster is drawn from the #1 cylinder runner. This means that every time you step on the brakes, you're creating a super-lean running condition in that cylinder, and that will shortly lead to detonation (pinging) and potentially damage to the #1 cylinder that will require an engine rebuild or replacement.
Just because it is published work does not mean they know what they are talking about, too many so called experts should know better..
Firstly, if the booster leaks you have very poor braking, which means you wont drive the car with a leaking booster.
Second, On the TPI the vacuum for the booster is connected to the drivers side rear of upper intake manifold ... Cyl 1 is on drivers front and no 7 is drivers side rear. However these cars are fuel injected so it will not affect the air fuel mixture, it can affect idle a slightly high idle would be the symptom if the booster leaked enough.
I shakes me head .....
