Engine dies after running for 30-40 minutes - Maserati Forum
 
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post #1 of 14 Old 06-08-2019, 03:23 AM Thread Starter
 
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Engine dies after running for 30-40 minutes

Having a serious problem: LONG

So yesterday, I replaced the battery in 06 GranSport with a proper glass mat battery. It had the wrong battery in it. It started and drove fine for 45 minutes to and hour. Great! So I took the time to install a new Sony headunit(plug and play, nothing special). No problem. I took it out last night to go to dinner and after running for about 20 minutes it stalled at a traffic light. The car was in neutral. I tried restarting it and it just cranked and didn’t fire. So I pushed it into a parking lot. Tried starting it again and just cranked. So I gave it some throttle and it fired right up, but wouldn’t idle. As soon as I let the throttle below 1800RPM it would die.

So I let it sit, turned the battery off and tried again. Same thing. Give it gas and it would start but would die as soon as I let off the gas. At this point, the check engine light is staying on. I let it sit for about 45 minutes waiting on a tow truck. When the truck got there, I tried it one more time and it started normally. The tow truck followed me back to my house and it ran fine the whole time.

Tonight, I go out to do a proper battery reset and all is well. Let it go through its diagnostic relearn and it was fine. I took it out for a 4-5 mile test drive and it was fine. Get back home, and I’m just sitting there playing with my new radio for about 5-10 minutes in the driveway and it just dies. Like turning off the key. No stumble, no warning, nothing out of the norm. It just just shut off. And now it won’t start again. Just cranks. Give it gas and it starts. Let off the gas and it dies.

I’m guessing it’s probably a coincidence I replaced the battery and this happened. My guesses are a flaky fuel pump(I kind of doubt because it doesn’t stumble of seem like it’s starving for fuel), the throttle body or the MAS air sensor. Of course the check engine light isn’t on now.

Any thoughts?
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post #2 of 14 Old 06-08-2019, 07:11 AM
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Loos connection, possibly. The nuts on the positive terminal can work loose and if one of them has been disturbed it might cause the issues.

However, code reader would be a sensible start.

C

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post #3 of 14 Old 06-08-2019, 10:24 AM Thread Starter
 
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I’ll start there for sure tomorrow when I have time to mess with it. I’ll also put the factory radio back in. I suppose it’s a remote possibility that it isn’t happy with the third data plug not in use. Perhaps it’s a security system fault...
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post #4 of 14 Old 06-08-2019, 11:42 AM
 
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How about a bad crank sensor? A car will run with a bad MAFS.....Jason

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post #5 of 14 Old 06-08-2019, 12:30 PM Thread Starter
 
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Anything is possible. I wouldn’t think that would cause I to just shut off after already running for a while though. I would think it wouldn’t start at all.
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post #6 of 14 Old 06-08-2019, 01:14 PM
 
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When it gets hot it can go open circuit and just die...Then when it cools again it may start....Jason

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post #7 of 14 Old 06-08-2019, 03:03 PM Thread Starter
 
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That makes sense. Hopefully I can dig some codes out of it.
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post #8 of 14 Old 06-08-2019, 03:25 PM
 
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Radio shouldn't effect immobilizer and that won't make running car quit.....Jason

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post #9 of 14 Old 06-08-2019, 08:32 PM
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I had a wonky fuel pump on a motorcycle once. Worked ok when cold, but after it was running for a while it would stop and engine would quit. Should be pretty easy to check fuel pressures.

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post #10 of 14 Old 06-09-2019, 10:46 PM Thread Starter
 
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So I got a code out of it. P0102, MASS or Volume Air Flow A Circuit Low. So I cleaned the MAF and that didn’t help. So, I found a good used one and have it on the way. Hopefully that solves it 🤞🏻
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post #11 of 14 Old 06-13-2019, 04:56 PM
 
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MAF Failure

Years ago when I first got my 05 Spyder the MAF connector somehow was loose. My symptoms was that the engine would not idle. When stopping I needed to manually keep the RPM's up and of course this made taking off from a stop problematic. Once I reconnected the sensor to the outside of the MAF everything was back to normal.

As a suggestion you could try disconnecting the existing MAF and see if your symptoms change.
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post #12 of 14 Old 06-13-2019, 07:15 PM Thread Starter
 
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It’s fixed now. It was the MAF sensor. It looks like the BMC air filter I installed about 1,000 miles ago may have been over saturated with oil and it gradually pulled that oil up the intake system and some made contact with the MAF hot wire and fouled/killed it.
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post #13 of 14 Old 06-13-2019, 07:47 PM

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Quote:
Originally Posted by NeverEnoughVA View Post
Itís fixed now. It was the MAF sensor. It looks like the BMC air filter I installed about 1,000 miles ago may have been over saturated with oil and it gradually pulled that oil up the intake system and some made contact with the MAF hot wire and fouled/killed it.
Very common problem. I stick to paper for that reason.

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post #14 of 14 Old 06-14-2019, 03:17 AM
 
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+1...I put one in my Range Rover..I was rewarded with a check engine light within 150 miles.. Plus I didn't get the 20 hp it said on the box.. A cotton gauze filter is better than paper, but I wouldn't oil one... Jason

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