very weird problem

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Aug 14, 2005 | 10:12 AM

aarontrio

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very weird problem

ok. so i start the max and it seems to be missing and running rough but when i get to about 3500 rpms it kicks in and takes off like a bat outta hell....any answers??? i just replaced the plugs and feul filter about 50 miles ago.

aaron

Aug 14, 2005 | 10:18 AM

nismosleeper

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hmmm... Try vacuum leaks, and make sure that the exhaust system is working properly.

Aug 14, 2005 | 10:35 AM

aarontrio

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exhaust is new and i checked for vacuum leaks....my teacher at school says it may be an O2 sensor or a MAF sensor...

aaron

Aug 14, 2005 | 11:13 AM

Wiking

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Posts: 4,323

From: EU Scandinavia

Quote:

Originally Posted by aarontrio

...O2 sensor or a MAF sensor...aaron

Unplug O2. Tst. If no behaviour change, its the ou-too... (is it?) Some say that O2 is not used on high rpm, but so far I havent found such info in FSM.
- U may also tst sensor resistance: 5.2-8.2 ohms @ 77°F (25°C)
- do ECU selftst
- Check light should be on. (dunno really)
http://www.cardomain.com/ride/748507/9

Aug 14, 2005 | 02:31 PM

internetautomar

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VE or VG?
either one, I'd blame injectors. VE just gets to have the knock sensor tossed in for good measure.

Aug 15, 2005 | 08:32 AM

Alex_V

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Ah the knock sensor, great for wasing power, money and gas!

~Alex

Aug 15, 2005 | 09:32 AM

pito11213

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Well I have similar problems on a potential max I want to get. The car needed to be jumped so I am guessing the alternator may be bad because when I went to start it it just clicked. Then when I jumped it it started but idled horribly. A terrible shake in the engine. Then when you put the car in drive it dies. TPS has already been changed and no check engine light when car is running. Possible causes????

Aug 15, 2005 | 09:39 AM

Greeny

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From: Tunasea

Quote:

Originally Posted by aarontrio

exhaust is new and i checked for vacuum leaks....my teacher at school says it may be an O2 sensor or a MAF sensor...

aaron

I would bet on it being the knock sensor and/or subharness...

Aug 15, 2005 | 09:40 AM

Wiking

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Joined: Dec 2004

Posts: 4,323

From: EU Scandinavia

Quote:

Originally Posted by pito11213

...Possible causes????

Depends on engine: VGE http://www.cardomain.com/ride/748507/9

Check charge voltage, alt leak current.

Aug 15, 2005 | 09:47 AM

#10

pito11213

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Posts: 71

Sorry... it is a regular VG. A 91 SE.

Symptoms:
Battery was dead and friend says it would not hold a charge (Alternator???)

Jumped battery for a few minutes then it starts right up (Alternator???)

Runs horrible. Terrible shaking and when I pressed the gas the rpms went to like 1500 and stayed there for too long. Put it in drive car shuts off. Starts right back up.