300ZX (Z32) Performance / Technical Discussions related to Turbo charging, Supercharging, Engine, ECU, exhaust, and etc. performance enhancements and Techical related.

1990 300zx non turbo

Old Aug 10, 2014 | 02:45 PM
  #1  
workingmanmex's Avatar
Thread Starter
Registered User
 
Joined: Aug 2014
Posts: 3
1990 300zx non turbo

I have what is probably a small problem but need help my car is really hard to start when cold.allot of cranking to get it running but as long as it is warm it starts first crank all day and runs like a charm. fuel psi is about 50 pounds all coil packs are firing checked one by one used the screwdriver method to check injectors each tick only problem I see is spark is a little weak what else can I check ecu code 55 all good
Old Aug 10, 2014 | 02:58 PM
  #2  
zxguy1986's Avatar
Registered User
 
Joined: Aug 2013
Posts: 1,103
Welcome to ZDriver

Pick up a free factory service manual at XenonZ32.com Reference along with the other cool docs. You will need them. Check out all the inspection and troubleshooting pages in your FSM, easy to read and follow.

Our Z32 pros will have some input for you. Just hang on.

Thanks and welcome.
Old Aug 15, 2014 | 10:42 AM
  #3  
workingmanmex's Avatar
Thread Starter
Registered User
 
Joined: Aug 2014
Posts: 3
1990 300 zx 2+2

Purchased this car about a month ago. Car is very hard to start when cold. After it is warmed up the rest of the day starts first crank. Things I've done.

1. Replaced Cam Sensor
2. Spark Plugs
3 Temperature sensors
4. Fuel Pressure good
5. Coil Packs.

I found that if I disconnect the fuel pump the car starts right away first crank. I can then plug it in and car runs fine. Is the injectors leaking to much fuel into the motor when it sets.

The only thing I haven't replaced is the injectors they fire fine.
Old Aug 18, 2014 | 08:43 AM
  #4  
workingmanmex's Avatar
Thread Starter
Registered User
 
Joined: Aug 2014
Posts: 3
1990 300zx

After trying everything my car still takes a long time to start when cold. After warm up starts all day first crank. A question The fuel pressure with the pump running is 60 PSI but when I shut off the key it drops to zero really fast. I can take the hose from the filter and hardly no gas comes from rail side. I looked for a check valve on the pump but it doesn't have one.
Any Advise
Thanks
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
300zxbuilttwin
For Sale (VIEW ALL)
0
Apr 24, 2014 01:05 AM
ZxTwinTurbo10
FS: 300ZX (90-96)
0
Jul 21, 2013 07:08 PM
Habitjr21
300ZX (Z32) Performance / Technical
27
May 5, 2009 05:20 PM
nissanman5
300ZX (Z32) Performance / Technical
0
Jul 16, 2002 12:46 AM


Thread Tools
Search this Thread

All times are GMT -7. The time now is 11:16 PM.