Car stumbles on cold start

[s2cmpugh]

I did a voltage test on the battery and compared it to another battery in a working car. Both said 12.3 Volts.

[MIKEYZCB7]

I had the same exact problem,had to crank a little longer and it felt like it was missfiring (stumbling) at startup.I changed the PGM-FI main relay and it got better.

[wed3k]

mine does the same thing.

it fires up but immediately almost goes to 750 rpms and then slowly comes back up to 1500.

[s2cmpugh]

mine does the same thing.

it fires up but immediately almost goes to 750 rpms and then slowly comes back up to 1500.

That's EXACTLY what it does. Any ideas on a fix or anything??

[s2cmpugh]

I had the same exact problem,had to crank a little longer and it felt like it was missfiring (stumbling) at startup.I changed the PGM-FI main relay and it got better.

I thought the main relay issue was related to more of a hot start issue>?

[91@CCORD74]

I thought the main relay issue was related to more of a hot start issue>?

x2

[MIKEYZCB7]

I'm a nissan certified tech,I would know.the main relay controls the fuel injectors.It's missfiring at start up because the injectors aren't sparying right

[s2cmpugh]

I'm a nissan certified tech,I would know.the main relay controls the fuel injectors.It's missfiring at start up because the injectors aren't sparying right

So even if I hear the relay click on, then off when I turn the key to "II" that doesn't necessarily mean it's working properly? If that's the case, why only on cold starts and not hot, or warm, or halfway cold?

I'm heading to the JY this weekend, maybe I'll grab an extra one for fun.

Cris P.

[sugar]

Check the TPS(Trottle Position Sensor) or Idle Control Valve their is no adjustment on it but sometimes they get a lot of Carbon in it,if you take it off try to clean it or just replace it. GOOD LUCK !!!!!!!!

[s2cmpugh]

Battery got tested today and it's good! I also swapped batteries with a known good one, and the same cold start issue occurs.

I REcleaned the IAC (tested IAC and it's good) and FITV.

I doubt TPS b/c that would throw a code and car would run shitty during anytime.

My other options are main relay...OR would a belt that's too loose cause this?

I noticed after I replaced the belts they would slip a bit on cold starts, and while slipping the car wouldn't raise to high idle until the belts caught. Should I tighten them up a bit since they may have stretched a bit after replacement?

[s2cmpugh]

Here is a video of my cold start issue.

http://www.youtube.com/watch?v=QvaIItCLSBo

[MIKEYZCB7]

Battery got tested today and it's good! I also swapped batteries with a known good one, and the same cold start issue occurs.

I REcleaned the IAC (tested IAC and it's good) and FITV.

I doubt TPS b/c that would throw a code and car would run shitty during anytime.

My other options are main relay...OR would a belt that's too loose cause this?

I noticed after I replaced the belts they would slip a bit on cold starts, and while slipping the car wouldn't raise to high idle until the belts caught. Should I tighten them up a bit since they may have stretched a bit after replacement?

after you cleaned the IAC it was still hard starting ?,because cleaning that could help because it can build up carbon deposits over time.

[MIKEYZCB7]

also I saw your vid,my car had the same exact problem.Changed the main relay and it got alot better

[jimborob76]

i think your having the same problem that i had with my car if your car starts like putting and struggling to idle for a few sec when your turning the ignition its your fuel injection relay

[jimborob76]

thats exactly what it is i just watched your video ied get it changed before it gets worse and dosent start at all thats what happend to me i had to get it towed it sucked