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Vacuum Problem?


Caymen Ranger

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I've lurked for years, though never had any problems worthy of you guys. Hopefully you can help...

My vehicle had been running rough for a while. I finally got around to checking it out and replaced two vacuum hoses. Now, it is very difficult to start the vehicle (it'll turn over for a while, though it doesn't want to start). When it finally does start, it stumbles very hard, though it quickly levels out and runs nicely. It does feel easy to stall, meaning I have to give it more gas than usual to move it around my driveway.

Today, I turned the heat on and the engine stumbled. I started thinking about the vacuum system and decided to pumped the brakes. Pumping them caused the engine to nosedive and stall almost immediately. Any ideas?
 


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BRUTUS_T_HOG

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try to plug off the large hose going to the brake booster. do you hear any hissing in the cab? do the brakes feel abnormally hard to press?

i usually take the check valve out and reverse it in the hose to block off the hose
 

Caymen Ranger

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As a matter of fact, the brakes are much harder to push in. With constant pressure applied, they do slowly "press in", however I'm not sure what effect his has on my actual braking power as I wasn't moving while doing this.

I'll go give the hissing a shot from the cab, however I can certainly hear a hissing/bearings noise coming from the power steering pump. They're not related, though it might be masking the other noise (if there is one).
 

Mark_88

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If the brakes are hard then you may have a vacuum leak..which could cause the no start if it is large enough...you could try a vacuum tester on it...they're fairly inexpensive...

But, just to save you going out to buy one, check the PCV cannister under the intake...make sure it is not loose and that the hoses are connected...your truck may start with this disconnected, but it won't run right or idle properly and will probably die...

Not starting at all could be something else...like fuel pressure, spark, timing, and others...
 


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