Question about 2001 Pontiac Bonneville

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Tune-up procedures lose power misses at idle speed

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Maybe spark plug wires were change for example, wire for plug one was conected to plug four , etc. or vacume hose was desconected in the process, like the pcv.

Posted on Apr 04, 2011

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Posted on Jan 02, 2017

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How do I fix, bad idle in suzuki swift , check light on, no codes.


the title is contradiction
" check light on, no codes."<< totally wrong
scan it one more time with a REAL scan tool this time. (there are DTC errors , or codes as you said)

what does bad idle mean? misfiring, or idle speed too low
or too high? RPM, or
surging?

say what that means please.
and more important is engine hot or cold ? failing.???? or both????
there are over 50 causes.
but can be broken down to simple physics and gauges.
1: engine bad, lost compression.
2: engine cant breath, dirty air cleaner
3: ISC stuck closed or open or just stuck. (bad idle air supply)
4: bad spark, 1 or all 4 (never had a tune in this decade.
5: cam drive, slipped (belt) causing #1 failure.
6: air fuel mix too lean, and causes rpm drop and ISC fails.
7: air fuel mix too rich and misfires.
8: egr stuck open, it misfires and ISC gives up.
9: cat clogged, engine cant breath #2 like.
10: and the vast other reasons for misfire.

we cant drive it, see it or hear it misfire, so.....????

there is a test for all 10, ask. or get car serviced.

Jul 29, 2015 | 2010 Suzuki Swift 1.6

3 Answers

Engine cutting out


Carburettor checkup and Tuning is necessary. Engine cuts in slow speed, so also check the accelerator wire.

Oct 09, 2008 | 2002 Volkswagen Passat

2 Answers

Why does my 1998 gmc jimmy rpm drop so low when its warm causing a miss in the engine


The truck ECM computer controls the idle speed based on a number of engine parameters. Idle drops to a minimum preset level when engine coolant reaches normal operating range and the engine goes into closed loop control. This idle is typically set at around 575 rpm, and cannot be changed without reprogramming the ECM. The miss is not caused by the idle speed - unless the engine is tuned properly and has not lost compression, this idle speed can result in a rough running engine at idle (typical with older 4.3L Vortec engines). Best bet is to get a complete tuneup which will include checking the O2 sensors, catalytic converter and cleaning the IAC valve and throttle body.

May 20, 2014 | 1998 GMC Jimmy

1 Answer

Did tune up but still acts like it's missing once in a while


skipped filters?
hiccup.s can be lots of things,
so tell when the hicup ,er misfire happens
hot or cold engine. ? or both.
at any speed. , only fast right foot?, or only wide open throttle?
only on hills. ?
so far , no miss at idle or slow speed.

Jan 26, 2014 | 1998 Jeep Wrangler

1 Answer

Increase then decrease idle when engine is cold especially


cold engine idle surge. (problem)
RPM range of surge not stated
300-700 or 800 to 1500? (range is critical to diagnosis)

bad fuel
running summer fuel in winter (running old fuel?)
needs a tune up bad, see the list in the operator guide.
idle speed controller,sticking or EGR valve same. (clean them)
location not stated, so cant guess about local air temps.?
no other symptoms, lack of engine power? etc?
was it ok last week, or better, when was the last time it was OK?
1week, 1year?
surge , causes, on a tuned engine might be:
1: too lean. so lean the ISC can not control idle. rpm low, stalling
2: too rich, flooding, stalling, spark plugs foul (look at them)
3: weak compression in 1 or more cylinders.
4: bad spark.
5: air leaks, in the plenum causing , ISC to lose control.
why high RPM?

especially?
well that means it fails hot too.
and there is a simple tests. for hot surge.
is engine fully hot? 180F and holds solid there?
say rpm is about 800
and you turn on head lights, heater fan and (not AC) and defrost.
the RPM must hold or the ISC is failing.
ISC -= idle speed controls. (all EFI has this function)

Oct 28, 2013 | 1996 Honda Prelude

1 Answer

Rough idle loses power with ac on and stalls at


wen is the last time u had a tune up

Aug 12, 2013 | 2006 Ford Focus

1 Answer

My car is losing horse power. Could it be the idle ? Or timing belt?


could be clog catalytic con.check air filter,fuel filter.tune up.

Mar 08, 2013 | Cars & Trucks

2 Answers

1999 Toyota Camry runs good idling, but put in drive it loses power and sputters


may look good but that means nothing if electrode in any spark plug go's op[en circuit when warm it will spluter as it will be mis fireing on that cylimber try a new set of plugs then check leads then distributor or electro ignition

Aug 14, 2012 | 1999 Toyota Camry

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