What might be causing a loss of power during engine warm up on 90 Skylark 3.3

Asked by Oct 09, 2012 at 01:42 AM about the 1990 Buick Skylark Gran Sport Coupe

Question type: Maintenance & Repair

On a cold engine, starting out from stop feels ok until after trans shifts to 2nd gear then a slight loss of power occurs for a split second. Moments later it happens again. And sometimes a third time until speed is held steady in 3rd gear, then ok if not accelerating. But if I push pedal 1/2 way or more there is 100% loss of power until gas pedal is released. Sounds like engine has shut off but returns to idle and light acceleration again produces very slight momentary power loss as first described.
   After engine warm up, problem disappears.   A month ago I replaced the IAC, which corrected a high idle problem. Has run fine until last week when the power loss started. Since then have checked the computer coolant sensor 5 Volt reference and ground circuit - both ok, sensor ohm test which was ok also, but since I had the sensor out to test it I just replaced it anyway. TPS voltage within range at closed throttle and rises incrimently as throttle is opened. Cleaned MAF with CRC MAF cleaner and did circuit test, which was ok.
   Fuel filter was replaced recently. Fuel pressure normal and dead heads at +60 . Fuel volume good. No engine codes ever set. Never an engine miss, and great spark with a spark tester.
    Again engine never shuts down. Seems like all injectors are killed under heavier acceleration but fuel pressure is maintained during problem. I do hear air being drawn in. After engine warms up - runs OK.  
    Any help would be greatly appreciated.

1 Answer

770

this is just a possible cause and only if the car is equipt with a distributor rotor set up. the problem could be caused due to a partial broken wire that connects to the distributor moduale. a loose of power is caused when the distubutor turns at an increased speed causing the wire to move slightly . this problem usally causes the eng. power to flatten out with no excelleration

1 out of 1 people think this is helpful.

Your Answer

Add photo

Related Questions

Search Buick Skylark Questions

UK Questions

Are you a UK consumer? CarGurus now has a discussion forum in the UK.

Buick Skylark Experts

#1 FordNut
FordNut
Reputation 210
#2 GopherTEFT
GopherTEFT
Reputation 160
#3 Js08016
Js08016
Reputation 150
View All

Related Models For Sale

Used Chevrolet Camaro
475 Great Deals out of 39,922 listings starting at $3,499
Used Ford Mustang
582 Great Deals out of 41,215 listings starting at $1,699
Used Buick Regal
162 Great Deals out of 11,415 listings starting at $1,995
Used Buick Riviera
140 listings starting at $3,000
Used Buick LeSabre
8 Great Deals out of 2,329 listings starting at $1,768
Used Pontiac Firebird
18 Great Deals out of 808 listings starting at $3,000
Used Chevrolet Caprice
179 listings starting at $9,950