Stalls when engine gets to temp

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May 4, 2019 | 11:43 PM

Brew23

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Stalls when engine gets to temp

Checked the codes get 33 34 replaced Maf relays by battery but no fix any suggestions thanks

May 5, 2019 | 12:01 AM

aklim

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From: Hartford WI

Quote:

Originally Posted by Brew23

Checked the codes get 33 34 replaced Maf relays by battery but no fix any suggestions thanks

What exactly are we talking about? Can you fill up the profile so we at least know what you own and where you are? I promise black helicopters won't come looking for you, assuming they aren't already there.

Seriously, we need to know those things before we can help.

May 5, 2019 | 12:07 PM

Brew23

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Sorry I have a 1989 c4 350 vette thanks

May 5, 2019 | 01:01 PM

aklim

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From: Hartford WI

OK. You have an MAF. Lets try this. See if it does the same thing with the MAF disconnected. Also check fuel pressure at that time. Will it restart?

May 5, 2019 | 01:31 PM

Brew23

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Yes it will restart I have to put it in neutral and keep idle up so it won’t stall but it will start every time

May 5, 2019 | 01:36 PM

aklim

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From: Hartford WI

Quote:

Originally Posted by Brew23

Yes it will restart I have to put it in neutral and keep idle up so it won’t stall but it will start every time

Do you have access to a scanner and NOT a code reader? Maybe your coolant temp sensor in the front of the motor is bad? It might be giving a false signal. I would scan the car and see if the sensor is giving a true reading. Sounds like it gives problems in open loop so I would be interested to see if the computer thinks the engine is at a certain temp while it is not. Maybe hit the sensor with an IR thermometer so you can compare what the ECM thinks the temp is with what the real temp is? That or just make a SWAG and change the sensor. You still need the scanner so you can see if the IAC is doing anything.

May 5, 2019 | 01:52 PM

Brew23

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Thanks I will change the sensor but I don’t have access to a scanner

May 5, 2019 | 02:26 PM

aklim

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From: Hartford WI

Quote:

Originally Posted by Brew23

Thanks I will change the sensor but I don’t have access to a scanner

You are going to need one sooner or later. Might as well buy one that can hook up to your bluetooth phone.

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May 5, 2019 | 02:53 PM

Brew23

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Could you please let me know a brand you suggest

May 5, 2019 | 03:20 PM

#10

aklim

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From: Hartford WI

Quote:

Originally Posted by Brew23

Could you please let me know a brand you suggest

http://www.1320electronics.com/products.html

May 5, 2019 | 04:33 PM

#11

Brew23

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Awesome thanks

May 5, 2019 | 06:30 PM

#12

CorvetteRules

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From: Mays Landing, NJ

The only code I had on my 91 when it would stall once warmed was a 15 pointing directly at the CTS. You can try unplugging the CTS to see if it stays running once warmed up, but from the codes you got I don't think it would be the CTS.

Last edited by CorvetteRules; May 5, 2019 at 08:03 PM.

May 5, 2019 | 06:49 PM

#13

aklim

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From: Hartford WI

Quote:

Originally Posted by CorvetteRules

Does the 89 have 2 temperature sensors? One for the gauge and the other is for the ECM? Not sure.

He could try to disconnect the MAF and see if that helps.

May 5, 2019 | 08:05 PM

#14

CorvetteRules

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From: Mays Landing, NJ

Quote:

Originally Posted by aklim

Does the 89 have 2 temperature sensors? One for the gauge and the other is for the ECM? Not sure.

He could try to disconnect the MAF and see if that helps.

May 5, 2019 | 09:00 PM

#15

Brew23

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Not sure I will check

May 5, 2019 | 10:10 PM

#16

Brew23

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Quote:

Originally Posted by aklim

Does the 89 have 2 temperature sensors? One for the gauge and the other is for the ECM? Not sure.

He could try to disconnect the MAF and see if that helps.

if I unplug will the engine continue to run or will at stall like when plugged in

May 5, 2019 | 10:17 PM

#17

aklim

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From: Hartford WI

Quote:

Originally Posted by Brew23

if I unplug will the engine continue to run or will at stall like when plugged in

Let's see what happens. If it keeps running, the MAF is bad

May 5, 2019 | 10:38 PM

#18

Brew23

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Ok thanks if I unplug maf it stalls instantly

May 6, 2019 | 12:08 AM

#19

aklim

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From: Hartford WI

Quote:

Originally Posted by Brew23

Ok thanks if I unplug maf it stalls instantly

AFAIK, and I don't have a MAF car, it will trigger a code and thus force the ECM to run off the tables. If it runs off the tables fine, the MAF is suspect.