Hi there, I own a 1993 Bonneville SE and this is my first post here. I've been having a strange problem with the engine for a while. The ignition starts fine and then the engine operates within the 1500-1700 rpm. When I accelerate (engine still cold), it kind of chokes (with muffled backfire-ish sounds...) and won't go past 2500 rpm. After a longer drive this is no longer an issue, everything works nice and smooth. I've replaced the fuel filter recently but it didn't help and I'm running out of ideas.
I'll be grateful if someone can give me a hint/suggestion how to sort it out. Thanks!

Could be the throttle position sensor. Any codes?
When cold the engine is in closed loop running enrichment mode.....possibly fuel related.

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2000 SSEi - SilverBullet - 78,000 kms, 4" "straight shot" custom headlight ram air inlet, TOGs, 1.9's, Lsd, 2.9-3.4"MPS 10-15 psi, Ported GenV, EGR eliminated, OR pushrods, oil volume kit, trani cooler & shift kit, Titanium retainers, 90 lb springs, 160 Stat, 42# injectors, Fuel pump voltage increase, Wideband O2, 3" to dual 2 1/2" Magnaflows, Snow Meth/water injection, after SC temp gauge, 255/50WR17, timing commander set 15-18*@WOT, 2 speed Fan over-ride, disabled DRL, Solid motor mount, Meziere Electric water pump, adjustable fuel pressure regulator, Drilled & slotted rotors/ceramics, GXP sway bars and STB, Upgraded and rebuilt transmission with ZZP 2500 rpm stall TC, Pioneer Bluetooth stereo with sub and 800 W amps, PB 13.5 quarter, (April 2014 car of the month)

I also wonder if the MAF is to blame. If you unplug the MAF, does the issue get better or worse?

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~Randall~


1993 Buick Park Avenue - 197k - Some odds and ends done - Simply won't die
1994 Buick Regal - 78k - Bone stock - Always ready for a good kicking
1990 Oldsmobile 88 - Gone to a better place

Thanks for your suggestions 2000Silverbullet and RJolly87. The engine service soon isn't flashing so I can't read any codes. I haven't tried unplugging the MAF yet.
Today it got even worse, I could hardly start the engine. Then I noticed some red oil underneath but it's hard to figure where it's leaking from...

Red oil is transmission oil. I'd try to get under there and find out where it is leaking from. Depending on where it is leaking from could help solve your problem

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-Mike
2006 Saab 9-3 SportCombi
-17x8 OZ Racing Superleggera wheels- -GReddy Exhaust- -K&N Panel filter- Tinted Windows- -Blacked out side markers-
Tune coming soon

2000 Bonneville SLE - Totalled