bigwee

iTrader: (1)

I just cleaned the iac with brake clean and now idle is all messed up. Was brake clean a bad idea?

Kico

yes it was a bad idea if drenched it in brake cleaner ,you should have wiped it with a rag and if necessary damp rag with brake cleaner. Does the idle drop down eventually or do you think that you can adjust the idle.?

maxfever1987

iTrader: (93)

should have done your research and used throttle body cleaner. theres a thread here that explains how to do it safely and effectively.

pmohr

iTrader: (26)

Have you tried to set the idle properly?

"All messed up" doesn't mean a damn thing.

bigwee

iTrader: (1)

Okay I found out it wasnt the iac I had a cut wire at injector on cylinder 1 right were the harness is held by the one of the mounts. Repaired the wire and fixed the problem momentarily, but the car seems to have symptoms similar to my brothers maxima when his throttle position sensor went bad. Poor acceleration, fluctuating idle and stalling. Is it possible to have a bad tps and not trigger a code?

The codes I have are primary ignition circuit failure and map sensor, which I have had for the longest time.

AndrewR2442

iTrader: (1)

Well if your injector was disconnected I would start there.


There are two tests the home mechanic can make, the sound test and the resistance test.

Sound test...
This test is performed with the engine idling. Use a mechanic's
stethoscope or a length of rubber vacuum hose, and listen to each injector.
All injectors should sound alike. If you find one which makes a different
sound (or no sound at all) you have found a problem.

Resistance test...
This test is performed with the engine off. Use an ohmmeter to measure the
resistance of each injector. This does not require removing the injectors.
I don't know the correct resistance value for the injectors on your model,
but they are typically a low number such as 16 ohms. The important thing
is they should all be equal. If you find one injector with substantially
higher resistance than the others, it is bad. If you find one with zero
ohms (short circuit) that is truly unfortunate, because the injector is bad
and it may also have damaged the Engine Control Module (the computer)
because of excessive current drain.

Measuring the resistance of the front bank of cylinders is easy because the
injectors are in plain view. Disconnect the injector electrical connector
for cylinder #2, measure the resistance, reconnect the connector. Repeat
for the cylinders #4 and #6.

Measuring the resistance of the rear bank of cylinders is almost as easy,
but it is difficult to reach the injectors. The resistance may be measured
at a conveniently located electrical connector. Notice the largest,
thickest electrical harness at the top of the engine. This is the Engine
Control Harness and it is shaped like a U, with the open top of the U at the
driver's side of the car. The U has two corners. Look at the corner
nearest the passenger seat. Just inside that corner you will find an 8-pin
electrical connector. This is connector F131. Disconnect this
connector. Now look at the male part, the connector half with the pins
exposed. They are arranged in two rows of four pins.
The pins are numbered 1 - 4 (top row) and 5 - 8 (bottom row).
Measure the resistance of:
- injector #1 between pins 1 and 2.
- injector #3 between pins 1 and 6.
- injector #5 between pins 1 and 5.
Be sure to measure the PINS, not the female receptacles.

The dealer's shop is equipped with high-tech diagnostic instruments. These are wonderful devices but they are expensive and the dealer has to recover his cost by charging you for diagnostic time. Sometimes the home mechanic can do legitimate diagnostic work with nothing more than a ohmmeter and a rubber tube.

To Test Ignition Coils:
With the ignition off, disconnect the electrical connector from the ignition coil. Connect the positive (+) probe of an ohmmeter to terminal no. 1 and the negative (-) probe to terminal no. 2 of the coil connector - the meter should indicate infinite resistance. Reverse the meter leads ( negative probe to terminal no. 1 and positive probe to terminal no.2) - the continuity should be indicated, but not zero ohms. If the results are not as specified, replace the coil.
Connect an ohmmeter between the secondary terminal ( the one that the spark plug connects to) and terminal no. 1 - the meter should indicate infinite resistance. If not, replace the coil.
Note - Ohm meter to test coils is not the most reliable way. Some peoples’ coils tested perfectly, but they still misfired.




Don't adjust the TPS until you are 100% sure it's faulty! it is very hard to reset.

The Procedure is in the link below


http://vbxmaxima.8m.com/tps.html

bigwee

iTrader: (1)

I just tested the tps and the resistance was higher than spec. At no throttle it had 700-800 ohms and at full throttle it had about 7000 ohms. When i get time tomorrow im going to adjust and see what I get.

maxfever1987

iTrader: (93)

be careful adjusting it, it can be quite difficult to adjust the tps