brisk

hi, my 03 maxima has hot start issue.

If the car is hot (after driving a while), then stop it and start it again, 80% of time it will stall (rpm quickly go to 0), I will have to give more gas to let it stay, once it stays, then no problems.

The cold start is always good, no issues at all.

Engine won't stall at red lights, so, only a hot start issue.

What could be the problem?

I searched the forum, it could be IAV, MAF or TB need to be cleaned, but it seems most of the problem you guys having are cold start problems, and my problem is hot start, so any suggestions?

Could this be a vacuum leak? As this happened after I replaced my transmission. It was good before I replaced the transmission.

thanks

brisk

anyone?

Scottwax

iTrader: (8)

Clean the throttle body. Mine was doing the same thing, cleaning the throttle body (since we don't have an external IACV) fixes the problem.

Andypot1985

iTrader: (1)

My car did this when i first bought it. What fuel do you run in the car? I only run 93 octane and i dumped a bunch of fuel system cleaner into the car. Its been a year and a half and i have not had this problem since.

Andrew

iTrader: (5)

try replacing the crankshaft position sensor.

read this also

http://www.rockauto.com/catalog/moreinfo.php?pk=2414970

Max_5gen

iTrader: (2)

Good link, thanks. I'd read the error codes first - if it's CPS ECU would record the code I think.

brisk

Thanks. I was thinking about this. But couldn't find any instruction for that... do you have any link?

Thanks. I use regular. I think I can give it a try -> buy a fuel system cleaner and try 93 and see if it works.

Thanks for the suggestion, this is the first time I heard about this sensor, I will have to investigate more about this stuff.

Thanks, yes, if I want to replace it I better get the code first. How much does it cost to get the code? I am in Toronto, Canada.

Thanks you all for your help!

brisk

BTW, once thing I don't understand is, I didn't have this problem before I replaced the tranny, it happened only after the tranny replacement... I am thinking this has something to do with the tranny replacement. I first thought about vacuum leak, but I did a little research and ruled out vacuum leak and symptom is different. Will tranny replacement touch throttle body or crankshaft position sensor?

thanks

Froggmann

iTrader: (6)

Yes clean the throttle body, after that do an Idle volume re-learn procedure (It's in the FSM, link is above the Quote button in my sig)

As for cleaning the throttle body, to be safe you'll need a helper or a brick to do it.

1. Get a can of Sea Foam Deep Creep
2. Remove the intake plumbing to the throttle body so you can see the butterfly valve.
3. Set the E-brake
4. Turn car ON, do not start the car.
5. Shift to Drive.
6. Have your helper, human or brick floor the gas pedal.
7. Spray until the carbon is gone, if you are careful you may use a toothbrush to help break it up. Just don't touch the valve.
8. Wait a little bit of time (20 minutes or so) then put your intake back together.
9. Start your car, it will be hard to start because it is essentially flooded. If it doesn't start on the second try, hold the key in the start position and floor the gas. The car should cough back to life. Do not exceed 4 attempted starts. The ECU will kill the fuel system thinking the car is being stolen.
10. Kill some mosquitoes, this is easy just idle the car or rev it up to about 2K. The smoke will be a combination of carbon and seafoam.

brisk

Thanks!

two questions.

1: where is the TB? do you have a picture?

2: in you FSM link, which PDF shows the relearn steps for idle speed? I checked EC.pdf, didn't see it.


thanks

waukly6

This is the typical problems of malfunction of cam shaft position sensor.Base on service maneul could happen one of the following condition;1) no signal at first few second when start 2)no signal when engine is running.3) sent out abnormal penterm.Any code detected? When engine is hot this sensor will start has problem,especially many years old sensor.

brisk

No code at all.

Max_5gen

iTrader: (2)

Have you performed idle re- learn procedure after transmission replacement?

I recently replaced my radiator support together with radiator and the car started to have this hot start stalling problem. After performing idle air re- learn procedure it came to normal. Search the forum there should be one for your year model.

In my case ECU seemed to freak out after I disconnected air temperature sensor during radiator replacement. While I can't see how it could be relevant and I'm sure I didn't touch MAF, TPS or other sensors this is what happened nonetheless.

brisk

Just tried idle relearn, doesn't work, still the same

Max_5gen

iTrader: (2)

Well it was worth a try... Silly question but still - does it idle at correct rpms after the engine is warmed up?

Scottwax

iTrader: (8)

Clean the throttle body, that's the solution.

brisk

yes, it does, even before the idle relearn.

I am going to perform the TB cleaning today.

Now I am little worried what if I cannot start the car within thye four tries after the cleaning?

This is what I meant:

03blackSE

Ive had this same problem for awhile now. I just give it a little gas on hot starts from keeping the engine from stalling.

I'm on the fence about cleaning the throttle body, as I've read numerous horror stories about touching the butterfly and whether you should put your keys to the 'on' position.

brisk

Good news, clearned the TB and the problem seems to be gone. I followed this instrucitons (don't have the link at this moment):

I have a AT, so I put the gear to D and the butterfly is fully open when floor the accelerator. I sparyed seafoam and then cleaned it with cloth, I didn't touch butterfly only cleaned the TB, it was really bad.

after that I got P0113 error then I erased it and no problem yet.

So the key for the 02-03 DBW TB is to not force butterfly to open. In another words, floor the accelerator to let it open.

Thanks everyone for the suggestions, it really helped me.

brisk

I have previously owned Camry, 2 accords, 1 civic, they all have higher mileage then this maxima, why I don't have the problem on those cars? Is it NISSAN specific problem?

thanks

trooplewis

iTrader: (1)

I used Deep Creep this AM on the throttle body, but did it with the car running, figured I'd give the combustion chambers and intake manifold a good cleaning while I was at it.

With the MAF off the intake, car will not let you rev over 2500rpms, had a helper giving it just enough gas to prevent a stall, ran like that for 3-4 minutes, shut engine down for 15 minutes. Put everything back together, started engine up, smoked out the neighborhood, ran the car around the block to blow the loose carbon out, worked fine.

It did throw a code as soon as I restarted after having the MAF off, 1102 I think. I just erased it with my $35 ebay code reader and it did not come back. Idle and everything else seems fine.

Max_5gen

iTrader: (2)

and especially puzzling for me was that in your case it started right after transmission replacement. I thought TB couldn't get dirty from transmission replacement... Congrats with fix, hope it lasts.