cam swap starting issue
Originally Posted by Boosted 99 TA
today i tried to run the car....well without the maf and the iat unplugged it tries to idle...what the hell is goin on?? when i try to plug em in and run it it will die. When the car does run the power brakes do not work... i reved it up to 2k and still no power brakes..the cam is not that big it should still have osmething. what yo uguys thinkin
Can't blame the MAF until you rule out a big vacuum leak. MAF measures metered air into the engine, it can't detect a leak.
This should help
http://www.aa1car.com/library/vacleak.htm
This should help
A faster technique for finding intake manifold vacuum leaks is to get a bottle of propane and attach a length of rubber hose to the gas valve. Open the valve so you have a steady flow of gas. Then hold the hose near suspected leak points while the engine is idling. If there is a leak, propane will be siphoned in through the leak. The resulting "correction" in the engine's air/fuel ratio should cause a noticeable change in idle speed and/or smoothness (Note: on engines with computerized idle speed control, disconnect the idle speed control motor first).
Originally Posted by hammertime
Can't blame the MAF until you rule out a big vacuum leak. MAF measures metered air into the engine, it can't detect a leak.
This should help
http://www.aa1car.com/library/vacleak.htm
This should help
http://www.aa1car.com/library/vacleak.htm
On The Tree
Joined: Jul 2005
Posts: 191
Likes: 0
From: Old Bridge "Raceway Park" N.J.
Originally Posted by hammertime
Can't blame the MAF until you rule out a big vacuum leak...
that was correct street lethal...but guys i just figured it out... my buddy didnt torque down the intake right...i re torqued it down hooked everything back up and she fires right up and idles smooth now...i am so happy...so long to my geo metro..its done its duties now i have my TA back!
Did you plug BOTH the MAF and the IAT in at the same time? You should try this test one sensor at a time to isolate the offender. You didn't make it clear in your post if you connected them at the same time or individually. The process of elimination is certainly a more reliable method of troubleshooting than speculation. I would start over again by plugging them both in to verify that the motor dies and then disconnect them individually this time to observe the results. Do you have any DTCs set? Are they MAF or IAT related? The IAT is a stepper motor that controls the blade postion to maintain idle speed. You can backprobe the IAT and MAF to verify that you have the proper voltages on them. You'll need a DVOM, a jumper wire with two aligator clips and a straight pin to backprobe the wires. A smoke machine would be nice at this point to check for vacuum leaks too.
