Question about 1987 Chevrolet Suburban

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Check engine light on but no codes

In my 1987 Suburban with a 454 and EFI the check engine light comes on once in a while. It always seems to be when I'm climbing a mild grade and only after a long time on the road, at least 30 minutes. I suspect some sort of EGR thing because it's at mid-throttle/moderate acceleration and hot that it seems to happen. I've checked all the wiring around the EGR and it seems OK. The real annoyance is it never leaves a code in the ECM. Next time I start it, even right after it happens, the light is off. I really don't want just start blindly throwing parts at it.

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Sounds like a sticking throttle/throttle cable - what is the IAC reading with engine off and ignition on? Make sure the throttle valve is completely closed when starting the engine. Even though a new TPS sensor, you should carefully check TPS readings as you gradually open the throttle with engine not running - any uneven increase in the readings can cause the problem.

Posted on Apr 18, 2017

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The check engine light will come on when the ECM detects knock, it will only stay on if excessive knock is detected. I would replace the fuel filter and check your fuel pressure.
Could also be a bad knock sensor as the ECM will also advance the timing to make the engine knock. If on knock is detected when the ECM is doing this it will light the check engine light.

Posted on Apr 18, 2017

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SOURCE: Code P2158/ Throttle Body

You most likley need to replace the whole unit. But without diagnosing it its all a guess. Look at it this way. You would of already spent a couple hundred at least to place one small part. If your wrong your now going to have to spend about $500 for the whole unit plus anothe diag possibly.

Posted on Jun 03, 2010

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Can anyone tell me what this is on my suburban?

That is the ODB11 Code Reader Port. When your engine malfunction light comes on, you attach a code reader to that socket and the machine give a P Code. That code tells the problem as stated from the ECM (engine control module.

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1994-4cyl.Camry(Cali)/auto/199,999 miles seems like an EFI problem. Engine will shut off while driving, feels like it's running out of fuel. Replaced EFI relay under the hood, ran for 2 weeks and now...

"Distributor issue"??? Thats very vague.
Go here,
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My 1987 chevy silverado suburban with a 454 fuel injection started burning through a ton of gas. I did not notice and visable leaks. I avearaged less then 4 miles per gallon. I smell gas fuems but I do not...

I would start by checking fuel lines starting from the tank and working my way to the fuel inlet/fuel rail. If no leaks found then you may have an electrical problem of some sort that is causing severe flooding. Is the check engine light on? If it is you may try to read any codes that are present and then list them here for further help and information depending on the codes. To retreive the codes use the diagram I am going to post, cross A and B with a paper clip and turn the key into the on/not cranking posistion. 170934_aldl_2.jpg

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