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Old 05-18-2017, 03:39 PM   #1 (permalink)
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Default EGR or should I say ERAARRGGHH!

(94 Sidekick.) I disconnected my EGR valve and my surging motor stayed the same. Shouldn't a motor hesitate when the EGR is disconnected? I recently had my motor rebuilt. Now the engine starts surging after the initial 5 seconds of warming up. My mechanic thinks that the engine rebuilder might have blocked off the port while putting on the exhaust manifold. HELP!!! BTW it ran perfect before the engine was rebuilt.
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Old 05-18-2017, 06:05 PM   #2 (permalink)
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Engine surges because the ECU has lost control of the idle, most commonly associated with the TPS calibration..

The engine should struggle or stall when the EGR is opened/activated during idle condition..

... Philip
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Old 05-19-2017, 01:19 AM   #3 (permalink)
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The video I made of my 8v:


Cheers!
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Old 05-19-2017, 09:14 AM   #4 (permalink)
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So I need to calibrate the TPS? And what do you think of the EGR?
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Old 05-19-2017, 11:13 AM   #5 (permalink)
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I rebuilt my 94 4 door engine 4 months ago, and never encountered this problem. Surging is not EGR related (to the best my of my knowledge). If blocked or deleted it would not affect idle, but out of calibration TPS or maybe even out of control ISC will do.

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Old 05-19-2017, 02:13 PM   #6 (permalink)
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Hmmm.....I might be a bit wary of your mechanic, as an EGR wouldn't cause an idle surge. The EGR is not activated during idle, and if it is (so in the forward position as in the video above), it would cause your engine to stumble. And your 94 will normally throw a code 51 for an EGR fault. As you've just had your engine rebuilt, I'd probably start with a compression test, just to verify that the engine timing is where it should be. And maybe give more information as to what your engine does from cold start, rpms, etc.
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Old 05-20-2017, 09:16 AM   #7 (permalink)
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The concern over the EGR is that it doesn't cause a stumble. Had a compression test performed and was good. The biggest question for me is that everything worked perfect before the rebuild. Whats the odds of something going bad like the ecu or the tps while being disconnected for rebuild? Could something have been damaged while the parts were put back on? To top it off I have no codes! When started idles between 1800-2200 when warm bounces from 1400-1600rpm. Also due to condition of spark plus it's running rich....Please help!
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Old 05-20-2017, 12:18 PM   #8 (permalink)
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Then perhaps you need to explain further, as your initial post was talking about surging (ECU losing control of the idle) rather than stumbling (EGR clogged, etc.)
You say you have 'no codes'. Is your check engine light on with the key on and off once the car starts? Can you get a code 12 from the diagnostic connector?
You say that the compression was 'good'. What is good? What was the actual result per cylinder? What do your spark plugs look like? Presumably various sensors were removed prior to the rebuild. Certainly your TPS would have to be recalibrated when it was reinstalled. Was that ever done?
Also, please spec out your car in your signature - what engine, tranny, mods, etc.
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Old 05-22-2017, 11:29 AM   #9 (permalink)
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I own a 88' Samurai with a 94' 1.6 16v motor. I'll add other stats later. Whats the process of re calibrating the TPI. It was NOT done...ugh! That sounds like a likely cause of my problem. Or can I just buy a new TPI?
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Old 05-22-2017, 12:23 PM   #10 (permalink)
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Quote:
Originally Posted by Poison Strat View Post
I own a 88' Samurai with a 94' 1.6 16v motor. I'll add other stats later. Whats the process of re calibrating the TPI. It was NOT done...ugh! That sounds like a likely cause of my problem. Or can I just buy a new TPI?
You would still need to calibrate the new TPS... If the sweeps prove good, no need to re/re..

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