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1988 Montero

Sent to Car Experts June 27 04:39 PM

Have given vehicle tune up,new egr valve,new reed valve timing is correct and idle speed is correct,it has a 2.6l engine and it iruns pretty good but when I back off on the gas and I am deccelerating I have popping and spitting coming from the ehaust system can yall please tell me what might be the problem and lately it seems I have smelled some exhaust in the passenger compartment.It is a 4/4 with manual transmission

 

Optional Information:
1988 Mitsubishi Montero 2.6L

Already Tried:
New wires,plugs,rotor cap,rotor button,new coil,egr vavle,reed valve,repalced some vacuum lines adjusted carb and have set timing

Customer (name blocked for privacy)
Status:  Closed   Value: $5
Answer
June 27 6:54 PM (2 hours and 14 minutes and 40 seconds later)
         
REPLIEDCheck Mark
Do a compression test on each cylinder , you may have a bent or burnt valve!! And also recheck your timing if compression is good.
Anastasio -- Auto Service Technician -- No feedback on 9 Car accepts
8 years automotive diagnostic and repairs experience in all kinds of cars.
Reply
June 27 9:48 PM (2 hours and 53 minutes and 40 seconds later)
         
Reply to Anastasio's Post: Had compression test done and all cylinders have good copression.
Customer (name blocked for privacy)
Answer
June 28 11:16 AM (13 hours and 28 minutes and 40 seconds later)
         
REPLIEDCheck Mark
Then most likely your timing is off. Check and adjust your base timing to (7 deg. +/- 2 deg BTDC)
Since you problem is happening upon acceleration/deceleration, check your timing advance in your diustributor. Check the vacuum hose for correct operation .
Anastasio -- Auto Service Technician -- No feedback on 9 Car accepts
8 years automotive diagnostic and repairs experience in all kinds of cars.
Reply
June 29 1:25 AM (14 hours and 8 minutes and 17 seconds later)
         
Reply to Anastasio's Post: I have set the timing going by the label which is using the marks which are dislayed under the hood,are you saying even by going by the book that the timing might still be off ahd also I have replaced the vacuum advance unit could i have replaced the vacuun advance unit wrong and as i have said i only get the poping noise on decceleration and it only stops when I put in neutral,and if the timimg is wrong how would I go about correcting it without using the label,sory to keep bugging you,also after the vacuum hose leaves the vacumm advance unit where does it connect to the carb or somwhere else.and can I rule out that a manifod lesk is causing the problem.Thank you.DEan Byrd
Customer (name blocked for privacy)
Answer
June 29 2:37 PM (13 hours and 12 minutes and 50 seconds later)
         
REPLIEDCheck Mark
If you have an intake leak that surely can be the cause of your problem!! Also check out you Idle air motor, or sensor and make sure its working properly, not sticking and that valve moves in the bore.. Go by the timing info I gave you,, it's straight from the manufacturer.
Anastasio -- Auto Service Technician -- No feedback on 9 Car accepts
8 years automotive diagnostic and repairs experience in all kinds of cars.
Reply
July 4 7:09 PM (5 days and 4 hours later)
         
Reply to Anastasio's Post: could a manifold leak be causing the problem?
Customer (name blocked for privacy)
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