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Lh0 engine stalls when warm, erratic idle

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Lh0 engine stalls when warm, erratic idle

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Old 11-05-2018, 04:13 PM
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Lh0 engine stalls when warm, erratic idle

Ok, Ií m still trying to figure out this problem. Engine stalls when reaches 220F, I have to step the pedal to avoid engine to stall. Runs great when cold. I just measured injectors ohms, all on 12,6- 12,8. Only the FPR is still to be changed. Could be this the solution? Over months I changed distributor, wires, spark plugs, map sensor, EGR valve, TPS, IAC, ECM...
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Old 11-05-2018, 04:42 PM
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Re: Lh0 engine stalls when warm, erratic idle

We need more information on your vehicle before anyone can help you! Year, engine size, and a list of any modifications are a good start!
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What makes you think that your fuel pressure regulator is bad? A bad FPR could definitely be your issue, but its best to do some diagnosis before performing repairs on your vehicle. I would recommend to verify that your fuel pressure is within spec.
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Old 11-06-2018, 02:04 AM
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Re: Lh0 engine stalls when warm, erratic idle

Oops, Ií m sorry! Here it is:

- 3.1 V6 Lh0 120000 miles
- 1990 Firebird
- replaced almost all sensors over the engine bay
- replaced ignition coil
- replaced fuel pump
- fuel pump relay (by the way, I think the car had a non factory anti-theft system, because I found the wires of the three relays on the firewall badly spliced and soldered)

In spite of this, I still have the stall problem. I have to set IAC or TPS? Has this something to do with?

Thank you guys!
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Old 11-08-2018, 10:07 PM
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Re: Lh0 engine stalls when warm, erratic idle

Disconnect the vacuum hose from the FPR, start the engine, and wait about a minute and a half. If fuel comes out of the FPR port replace the diaphragm, if not leave it alone.
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Old 11-09-2018, 04:23 AM
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Re: Lh0 engine stalls when warm, erratic idle

Ok, thank you! Ií ll try as soon as I can!
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Old 11-09-2018, 09:05 AM
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Re: Lh0 engine stalls when warm, erratic idle

The new FPR is just arrived, bought from Rockauto, the Standard one. I found some o-rings in the box, where do I have to place them?
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Old 11-09-2018, 01:13 PM
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Re: Lh0 engine stalls when warm, erratic idle

I replaced the FPR on my 350 tpi a few weeks ago, bought the part from NAPA and it came with a bunch of o-rings, didn't need any of them. I haven't had any issues. That being said, if you remove something that has an o-ring, it's good practice to replace it. I think that they include those thinking that you'll be taking apart the fuel rail. Now would be a good time to check/replace your fuel filter. Often times a clogged or old fuel filter is the cause of improper fuel pressure. Best of luck!
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