Could a mechanic think the piston is seized when actually it is the MAF cam/crank position sensor?

115

Asked by Jun 17, 2013 at 09:16 PM about the 2002 Pontiac Grand Prix

Question type: Maintenance & Repair

My 2002 Pontiac Grand Prix GT 3800 as had many problems since Sept 2012. The engine has had the manifold gaskets replaced with the new style ones that don't melt. Now out of no where the engine seized. Just before it happened I lost accleration, Temp when up and a ticking noise like there was no oil. I guess before I call it dead because the mechanic wants to put another engine in (not going there) I would like to know could there be a mistake? Does anyone have experience with this? Thanks.

4 Answers

77,785

A maf, cam or crank sensor will not cause an engine to seize up, some internal engine part failed. the 3800 engine as with any engine can give you years of trouble free service or years of headaches. I know of one engine problem the oil pump failed under warranty so they put in a used engine, it had a noise at first then it went away, thought it might have been a piece of carbon, ran fine for 2 months then one morning it started to make a knocking noise, back to the shop, they found that the noise that was there before was the oil pickup tube had been damaged and was cracked so the oil pump was sucking air more than oil and ran the number 3 rod dry, so warranty finally broke down and replaced it with a "crate" motor that car now has over 185000 miles without another engine problem. Just some info for you.

1 out of 1 people think this is helpful.
18,485

check oil level, if close to ok, try cranking with good battery ,if tight its seized! why ? maybe oil flow restriction, why temp.high? maybe was before seize ! pull plugs, squirt oil in, socket on damper pulley nut,try rotation. if moves can be saved maybe! cure oil restriction. filter,pump pickup as shoe bomber says ,or pump drive ,or gasket material in pump cogs snapping drive off. must pull pan to see ?.

1 out of 1 people think this is helpful.
56,575

Could be hydrostatic lock. Remove all 6 spark plugs and try cranking it. Could be the intake gaskets failed again and one or more of the cylinders is full of coolant. If this is the case coolant will squirt out the spark plug hole(s) on the effected cylinder(s) while cranking. A blown head gasket can do this too. HTH. -Jim

1 out of 1 people think this is helpful.
525

The 3800 had intake problems they like to eat away between egr circuit and a coolant passage, most likely got coolant in a cylinder and hydro,lock a cylinder..

2 out of 2 people think this is helpful.

Your Answer

Add photo

Related Questions

  • Maf sensor 4 answers

    think I cleaned the right part....but check engine light still on

    2002 Pontiac Grand Prix GT

    -

    Maintenance & Repair

  • Why when I replaced MAF sensor did my catalytic converter overheat? 10 answers

    My 2001 Pontiac Grand Prix 3.8L 3800 had a mass air flow sensor code so I bought a new sensor and the catalytic converter overheated. I replaced the new sensor with the old sensor and the problem we...

    2001 Pontiac Grand Prix GT

    -

    Maintenance & Repair

  • Could it be the MAF?? Please help!! 14 answers

    About 5 months ago after stopping at the gas station for a soda I started the car, it was very rough at idle, put it in reverse and the check engine light came on. It was sputtering and shaking. I o...

    2008 Pontiac Grand Prix Base

    -

    Maintenance & Repair

  • Possible MAF problem on 99 Grand Prix ? 4 answers

    My 1999 grand prix died on me last week while driving. I tried starting it a few times, it would start and unless i kept the RPM's up it would die. Even with the RPM's up it ran very rough and rich ( ...

    1999 Pontiac Grand Prix

    -

    Maintenance & Repair

  • I have a 1999 Grand Prix that I replaced the cam sensor, crank sensor and still no spark, what I try next? 1 answer

    Driving along and it just quit running, tried to start back up, ran for about two seconds and has not started again, replaced cam sensor, crank sensor and had replaced the icm about 6 months ago

    1999 Pontiac Grand Prix 4 Dr GT Sedan

    -

    General

Grand Prix

Looking for a Used Grand Prix in your area?

CarGurus has 3,766 nationwide Grand Prix listings starting at $1,995.

ZIP:

Search Pontiac Grand Prix Questions

Pontiac Grand Prix Experts

#1 Js08016
Js08016
Reputation 3,770
#2 Tom Demyan
Tom Demyan
Reputation 2,510
#3 munron
munron
Reputation 2,010
View All

Related Models For Sale

Used Chevrolet Impala
950 Great Deals out of 36,334 listings starting at $884
Used Pontiac Bonneville
668 listings starting at $2,298
Used Chevrolet Monte Carlo
19 Great Deals out of 1,738 listings starting at $1,695
Used Pontiac Grand Am
1,717 listings starting at $1,995
Used Chevrolet Malibu
1,164 Great Deals out of 78,643 listings starting at $2,495
Used Chevrolet Camaro
645 Great Deals out of 39,145 listings starting at $2,995
Used Ford Mustang
694 Great Deals out of 38,147 listings starting at $1,750
Used Nissan Maxima
411 Great Deals out of 25,124 listings starting at $1,500
Used Jeep Grand Cherokee
1,115 Great Deals out of 69,516 listings starting at $1,500

Used Cars For Sale

2008 Pontiac Grand Prix For Sale
13 Great Deals out of 472 listings starting at $1,995
2007 Pontiac Grand Prix For Sale
513 listings starting at $2,000
2006 Pontiac Grand Prix For Sale
7 Great Deals out of 618 listings starting at $2,000
2005 Pontiac Grand Prix For Sale
448 listings starting at $4,000