Replaced power brake booster - still no brakes
#1
Replaced power brake booster - still no brakes
Here we go again. 88 BII, 2.9, 4WD. My brakes were slowly fading and would go to the floor. At times I could pump the pedal and it would come back for a little bit, then it would start again. It happened on my drive home from work (62 miles). There is NO fluid leakage anywhere. The reservoir is full. I changed the power brake booster and it is worse. The pedal goes to the floor with minimum resistance. Now the engine runs at a higher RPM. When I first start it it hits 2,000 then after a few seconds it drops to about 1,500. When warm it is 1,000. When I hit the brakes there is a slight change in engine speed, about 100-200rpm up, then it settles down to 1,000. I pulled the codes and it passes. Like I said this all happened in one day. Any suggestions would be greatly appreciated.
Dave
Dave
#2
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I've noticed sometimes that my RPM's change a little when I press on the brake before shifting into reverse of OD. I don't mean to derail this but, Ken, do you have any vaccum diagrams of the engine compartment for a 2.9L? I've found a few hoses not connected to anything and my RPM's have been getting higher, so I found where some noise was coming from and I plugged it with tape. Lowered RPM's but I need to know where all the hoses go, and what leaks to check for. Thanks
#6
Don't have one right now so from memory... The fitting on the drivers side of the engine has ports for the brake booster, cruse control, climate control, and auto tranny. The one on the passengers side should go to the MAP and the air box. The ones on the throttle body should be the the PCV system. Please correct me if I'm wrong.
#7
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I'll try that today when I get home, Ken.
I did something that I don't like to do. I "shotgunned" my troubleshooting and as usual it did not fix the problem. I just replaced the MAP sensor and PCV valve. It made it run smoother, but the rev's are still at about 1,200 in park at idle and around 1,000 in gear.
Dave
I did something that I don't like to do. I "shotgunned" my troubleshooting and as usual it did not fix the problem. I just replaced the MAP sensor and PCV valve. It made it run smoother, but the rev's are still at about 1,200 in park at idle and around 1,000 in gear.
Dave
#13
87XLT,
It passes the KOEO test and I get codes 13 and 21 in the KOER mode. 13 has to do with idle not within self test range(no kidding!) and 21 has to do with coolant temp sensor or on the distributorless system the crankshaft position sensor.
Ken, haven't checked the IAC yet, hope to get to it this weekend. Will update when I do.
Dave
It passes the KOEO test and I get codes 13 and 21 in the KOER mode. 13 has to do with idle not within self test range(no kidding!) and 21 has to do with coolant temp sensor or on the distributorless system the crankshaft position sensor.
Ken, haven't checked the IAC yet, hope to get to it this weekend. Will update when I do.
Dave
#15
Okay, I got the problem with the high idle fixed. It seems that the person (me) who removed and installed the brake booster knocked the vacuum line off the driver's side manifold vacuum plug The wife and I kept hearing the vacxuum leak, but with all the other noises I got I really could not pinpoint it until I took a good look around. Thanks to all for the suggestions. I appreciate the help.
Dave
Dave