gcday47

Okay, so, first time posting here, need some serious help. I have a 1998 Maxima with an Auto Trans. Recently my old transmission decided it was its time to go, so I swapped another auto transmission from a spare 1997 Maxima I had. Now here is the problem, it's a fight to get it started sometimes. Yes it will start, but, after it runs/drives for a while (yes it drives/shifts perfect) it can be hard to start. Any ideas as to why after swapping an auto-auto 97-98 Maxima transmission might cause this problem will be much appreciated! Thanks!
EDIT: Threw a code P0745 after replacing the transmission. Tried some things and reset it, haven't driven it enough to see if the code is going to come back up.

PowerTotheMax

Possibly bad ground. I dont know if this also applies to automatic transmission, but usually in manual transmission the mating surface on tranny to engine should be sanded. Run a cable from your negative battery terminal to the longer starter bolt. Hope that works.

gcday47

Tried this, unfortunately no luck

CS_AR

Your hard to start problem could be caused by a failing Engine Coolant Temp Sensor (ECTS). Basically it sends a signal to the ECU that the car is cold and requires more fuel than necessary for warm starting or vice versa.

chrome91

iTrader: (1)

bad ground or coincidentally the coolant temp sensor took a dump as said

jholley

iTrader: (13)

Does the warm engine start easier by pressing the gas? If so the IACV could use a cleaning or replacement.

Code PO475 has nothing to do with hard starting. It's a faulty Line Pressure Solenoid within the VB or a blown dropping resistor. Read this thread for testing the line pressure solenoid via a connector external of the AT.

https://maxima.org/forums/4th-genera...ce-needed.html

If the solenoid is out of spec you can buy a new kit for $80. The PN is 31940-80X25. Here's a thread for replacing them.

https://maxima.org/forums/4th-genera...solenoids.html

If the solenoids test fine your dropping resistor may need replacing.

https://maxima.org/forums/4th-genera...oid-valve.html

gcday47

Actually usually it starts better with a little gas

gcday47

Possible cleaning with some throttle body cleaner?

jholley

iTrader: (13)

Yes you can clean the IACV with TB cleaner.

Read this thread for tips

https://maxima.org/forums/4th-genera...g-dummies.html

You can find that HowTo thread and many other's in the HowTo's: 4th Generation Maxima Sticky Thread. It's the 4th thread down in this forum.

Using the Search feature will also lead you to solve all of the common issues with these A32s.

CS_AR

How many miles do you have on your Maxima? To the points above about cleaning for common issues, it may be time to think about a good mid-life maintenance session where you replace valve cover gaskets and setup your Maxima to run well beyond 300,000 miles.

gcday47

Cleaned the hell out of my TB and the IACV still absolutely no luck, still so hard to start, at this point I just don't know what to do. The auto transmissions have an extra plug that goes to nothing right? Because there is one plug that I don't have plugged into anything. Pretty sure it doesn't go to anything. I replaced the TCU the resistor on the strut tower, cleaned the TB and IACV, nothing is working with this starting issue.

CMax03

iTrader: (3)

This hard too start condition, do you mean barely cranks or cranks alot before it starts?
If it's a barely cranks type starting condition I'll say clean your grounds and battery terminals. But it it's cranks well and doesn't start then that's a water temperture sensor/CHTS wiring/sensor issue or a sign of possible injector pintel issues....

Quickywd01

iTrader: (16)

How does it start in N?

jholley

iTrader: (13)

Have you tried opening the IACV adjustemnt screw further? Its a black plastic screw on top of the IACV. The further you open it the more air intake. When my IACV/ AAC failed years back I had to press gas to get the warm engine started. Lack of air was causing the hard starting issue. The plunger under the TB pushes back the plate for more air intake when the coolant is cold. When the coolant warms the plate closes with less air intake.

If that doesnt solve your hard starting I would next test the ECTS as earlier mentioned. They are low priced if replacement is needed.