Question about 1999 Pontiac Grand Am GT

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Engine surges under load at 3800 rpm

Will surge as much as 1000 RPM's when in Neutral and pressing gas to between 3000 and 4000 RPM's. Stalls at a stop inermittantly. When car is accellerating the fuel connection is fine. When you attempt to maintain a speed (not accelerating or decellerating) the engine shudders and shakes. 1999 pontiac grand am gt 3400 cc turbo mpfi runs a little ruff, engine surges at 3800 rpms. just started no loose connections or vaccum lines. car pulls unitl 3800 rpm mark and then just surges. Thought it could be fule pump?

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  • yadayada
    yadayada May 11, 2010

    do u have any system trouble codes?

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  • Pontiac Master
  • 3,640 Answers

Yes it could be. have fuel pump pressure tested, fuel pump pressure should be. (key on engine off) 1999 to 2000--with egr--41 to 47 psi without egr--52 to 58 psi,

Posted on Sep 13, 2009

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5 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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n_c_713
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SOURCE: getting a high pitched whining sound that increases and decreases with accelleration and decelleration

it is your idler pulley. get it from dealer comes with bracket, just use pulley off bracket. take your belt off and your idler pulley is lower right hand side(facing your engine). 15mm bolt, replace pulley and reinstall your belt. it;s a common problem on trailblazers

Posted on May 05, 2009

Benimur
  • 6966 Answers

SOURCE: Engine shudders at 35-40.

Hi,

Appreciate the direct "Ask Me".

Initially
, what comes to mind is probable faulty universal joints (U-joint), actually two of them and/or missing retainer clips. They would be coupling the transmission to the propeller shaft and then to the differential. The power train is nearly perfectly balance system and any missing needle bearing on any of the four ends of the U-joint wold cause a slight wobble on a particular speed. To check, the vehicle must be lifted and the propeller shaft yanked. There must be no noticeable play or slack.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Posted on Sep 05, 2008

  • 96 Answers

SOURCE: Will a GM 60 degree V6 work in my '97 Rodeo LS V6 4wd

No! Don't even try it!!!! The wiring harnesses and the computers are all different! Besides, the pushrod motor is vastly inferior in longevity. Change the oil and the SOCH motor will last a LONG time... the pushrod motor will wear out after about 120,000 miles. Seen enough of them to know!

Posted on Jul 21, 2010

  • 1915 Answers

SOURCE: My 1998 saturn SL2 chokes when I'm accellerating,

No check engine light? Have to guess, you might need to replace the plug wires, it could be a clogged fuel filter/regulator, or possibly the fuel pump.

Posted on Feb 10, 2011

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1 Answer

2000 Suzuki Esteem 1.8L.. I went to start my motor & turned it off right before started. I heard some kind of backfire. Then I started it and it's been idling high, the surging. Please help!!


scan it yet, a FULL OBD2 scan? why not?if not.
now is the time...


the 1.8L J18 engine, same as the older Sidekick sports used.
same engine , know it I do.
its the precursor to the J20, (j18 is under-stroked, j20 with many of the same parts. inside)
the back fire means explosion sound to rear end of tail pipe?
yes, that is rich raw fuel in the muffler. plus Air.
if there are exhaust cracks and then engine goes rich this can happen( a double failure)
if how ever BACK means, back to the Air cleaner, then that be different reasons, (timing)


engine now starts.?>
engine runs.? has full power, car drives ok.?
JUST?
SURGE,. you never said.

does engine get hot? 180F or more and holds (y/n)
ever get a full tuneup this decade,
most dont so i tell you, bad spark causes, misfire and raw fuel is wasted to the exhaust and sure can go boom.

surging usually means the ISC can not control idle
so it hunts, (a suzuki software engine on all 90s engines)
PCM errors, inside it. (dangerous too)
a modern car, if idle goes too high the ecu commands the ISC closed
and holds it there solid, (safe way , no hunting allowed now)]
so if this car surges, it's , lean engine.

some think flooding is surging.
and this is usually below 800 rpm,
almost stalls, then corrects, seems like a surge.

next time post rpm range of surge.?????

do not drive a surging engine, do not be like Toyota drivers. (over 800 rpm hot)

surge from 400 -800 rpm is class 1 surge.
surge from 800 to say 2000 RPM is class2, and very dangerous to some folks, (key off, get car fixed, tow it)

The ECU controls idle speeds. (hard coded servo controls)

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Be careful, could be dangerous, and similar to the Toyota problems before. Gas pedal and or linkage sticking? Last time serviced?

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no the surge that high is not normal a normal cold start should go to around 1500 then settle slowly to 750 or so but this all depends on engine temp and ambient air temperature

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The air conditioner puts a load on the engine. So it is typical for it to **** up some power. This is usually seen in the RPM dropping momentarily until the ECM (Computer) is able to bump up the idle into the 850-1000 range.

If this is what you're talking about, then it's normal. If the car surges with the A/C on, then their might be a problem with the compressor and/or compressor clutch.

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1990 Ford Probe 2.2 automatic stalls in forward, reverse OK


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